12c hidden undocumented parameter listOracle Database Tips by Donald BurlesonJune 30, 2013 |
Here is how to list all of the Oracle 12c hidden undocumented parameters:
select
ksppinm,
ksppdesc
from
x$ksppi
where
subsur(ksppinm,1,1) = '_'
order by
1,2;
_4030_dump_bitvec bitvec to specify dumps prior to 4030 error
_4031_dump_bitvec bitvec to specify dumps prior to 4031 error
_4031_dump_interval Dump 4031 error once for each n-second interval
_4031_max_dumps Maximum number of 4031 dumps for this process
_4031_sga_dump_interval Dump 4031 SGA heapdump error once for each n-second interval
_4031_sga_max_dumps Maximum number of SGA heapdumps
_ILM_FILTER_TIME Upper filter time for ILM block compression
_ILM_FILTER_TIME_LOWER Lower filter time for ILM block compression
_ILM_POLICY_NAME User specified ILM policy name
_NUMA_instance_mapping Set of nodes that this instance should run on
_NUMA_pool_size aggregate size in bytes of NUMA pool
_PX_use_large_pool Use Large Pool as source of PX buffers
__data_transfer_cache_size Actual size of data transfer cache
__db_cache_size Actual size of DEFAULT buffer pool for standard block size buffers
__dg_broker_service_names service names for broker use
__java_pool_size Actual size in bytes of java pool
__large_pool_size Actual size in bytes of large pool
__oracle_base ORACLE_BASE
__pga_aggregate_target Current target size for the aggregate PGA memory consumed
__sga_target Actual size of SGA
__shared_io_pool_size Actual size of shared IO pool
__shared_pool_size Actual size in bytes of shared pool
__streams_pool_size Actual size in bytes of streams pool
_abort_on_mrp_crash abort database instance when MRP crashes
_abort_recovery_on_join if TRUE, abort recovery on join reconfigurations
_ac_enable_dscn_in_rac Enable Dependent Commit SCN tracking
_accept_versions List of parameters for rolling operation
_active_instance_count number of active instances in the cluster database
_active_session_idle_limit active session idle limit
_active_session_legacy_behavior active session legacy behavior
_active_standby_fast_reconfiguration if TRUE optimize dlm reconfiguration for active/standby OPS
_adaptive_direct_read Adaptive Direct Read
_adaptive_direct_write Adaptive Direct Write
_adaptive_fetch_enabled enable/disable adaptive fetch in parallel group by
_adaptive_log_file_sync_high_switch_freq Threshold for frequent log file sync mode switches (per minute)
_threshold
_adaptive_log_file_sync_poll_aggressiven Polling interval selection bias (conservative=0, aggressive=100)
ess
_adaptive_log_file_sync_sched_delay_wind Window (in seconds) for measuring average scheduling delay
ow
_adaptive_log_file_sync_use_polling_thre Ratio of redo synch time to expected poll time as a percentage
shold
_adaptive_log_file_sync_use_postwait_thr Percentage of foreground load from when post/wait was last used
eshold
_adaptive_scalable_log_writer_disable_wo Percentage of overlap across multiple outstanding writes
rker_threshold
_adaptive_scalable_log_writer_enable_wor Increase in redo generation rate as a percentage
ker_threshold
_adaptive_window_consolidator_enabled enable/disable adaptive window consolidator PX plan
_add_col_optim_enabled Allows new add column optimization
_add_nullable_column_with_default_optim Allows add of a nullable column with default optimization
_add_stale_mv_to_dependency_list add stale mv to dependency list
_add_trim_for_nlssort add trimming for fixed char semantics
_addm_auto_enable governs whether ADDM gets run automatically after every AWR snapshot
_addm_skiprules comma-separated list of ADDM nodes to skip
_addm_version_check governs whether ADDM checks the input AWR snapshot version
_adg_buffer_wait_timeout Active Dataguard buffer wait time in cs
_adg_instance_recovery enable ADG instance recovery
_adjust_literal_replacement If TRUE, we will adjust the SQL/PLUS output
_adr_migrate_runonce Enable/disable ADR Migrate Runonce action
_advanced_index_compression_options advanced index compression options
_advanced_index_compression_options_valu advanced index compression options2
e
_advanced_index_compression_trace advanced index compression trace
_affinity_on enable/disable affinity at run time
_aged_out_cursor_cache_time number of seconds an aged out session cached cursor stay in cache
_aggregation_optimization_settings settings for aggregation optimizations
_aiowait_timeouts Number of aiowait timeouts before error is reported
_alert_expiration seconds before an alert message is moved to exception queue
_alert_message_cleanup Enable Alert Message Cleanup
_alert_message_purge Enable Alert Message Purge
_alert_post_background Enable Background Alert Posting
_all_shared_dblinks treat all dblinks as shared
_allocate_creation_order should files be examined in creation order during allocation
_allocation_update_interval interval at which successful search in L1 should be updated
_allow_cell_smart_scan_attr Allow checking smart_scan_capable Attr
_allow_commutativity allow for commutativity of +, * when comparing expressions
_allow_compatibility_adv_w_grp allow advancing DB compatibility with guaranteed restore points
_allow_drop_snapshot_standby_grsp Allow dropping snapshot standby guaranteed restore point
_allow_drop_ts_with_grp Allow drop Tablespace with guaranteed restore points
_allow_error_simulation Allow error simulation for testing
_allow_file_1_offline_error_1245 don't signal ORA-1245 due to file 1 being offline
_allow_level_without_connect_by allow level without connect by
_allow_read_only_corruption allow read-only open even if database is corrupt
_allow_resetlogs_corruption allow resetlogs even if it will cause corruption
_allow_terminal_recovery_corruption Finish terminal recovery even if it may cause corruption
_alternate_iot_leaf_block_split_points enable alternate index-organized table leaf-block split-points
_always_anti_join always use this method for anti-join when possible
_always_semi_join always use this method for semi-join when possible
_always_star_transformation always favor use of star transformation
_am_container_filesystem_ausize allocation unit size for non-ASM containers
_am_max_containers maximum number of containers
_am_max_groups maximum number of containers
_am_max_seg_bytes maximum number of bytes per array segment
_am_timeouts_enabled enable timeouts
_am_trace_buffer_size size of per-process I/O trace buffer
_and_pruning_enabled allow partition pruning based on multiple mechanisms
_appqos_cdb_setting QoSM CDB Performance Class Setting
_appqos_po_multiplier Multiplier for PC performance objective value
_appqos_qt System Queue time retrieval interval
_aq_disable_x AQ - Disable new cross processes at an instance
_aq_dq_sessions Deq session count
_aq_eq_sessions Enq session count
_aq_init_shards Minimum enqueue shards per queue at an instance
_aq_max_scan_delay Maximum allowable scan delay for AQ indexes and IOTs
_aq_precrt_partitions Precreate Partitions
_aq_pt_processes Partition background processes
_aq_stop_backgrounds Stop all AQ background processes
_aq_subshard_Size Sub Shard Size
_aq_tm_deqcountinterval dequeue count interval for Time Managers to cleanup DEQ IOT BLOCKS
_aq_tm_scanlimit scan limit for Time Managers to clean up IOT
_aq_tm_statistics_duration statistics collection window duration
_aqsharded_cache_limit Limit for cached enqueue/dequeue operations
_arch_comp_dbg_scan archive compression scan debug
_arch_comp_dec_block_check_dump decompress archive compression blocks for checking and dumping
_arch_compress_checksums enable/disable row checksums for archive compressed blocks
_arch_compression archive compression enabled
_arch_io_slaves ARCH I/O slaves
_arch_sim_mode Change behavior of local archiving
_array_update_vector_read_enabled Enable array update vector read
_ash_compression_enable To enable or disable string compression in ASH
_ash_disk_filter_ratio Ratio of the number of in-memory samples to the number of samples actually writt
en to disk
_ash_disk_write_enable To enable or disable Active Session History flushing
_ash_dummy_test_param Oracle internal dummy ASH parameter used ONLY for testing!
_ash_eflush_trigger The percentage above which if the in-memory ASH is full the emergency flusher wi
ll be triggered
_ash_enable To enable or disable Active Session sampling and flushing
_ash_min_mmnl_dump Minimum Time interval passed to consider MMNL Dump
_ash_sample_all To enable or disable sampling every connected session including ones waiting for
idle waits
_ash_sampling_interval Time interval between two successive Active Session samples in millisecs
_ash_size To set the size of the in-memory Active Session History buffers
_asm_access ASM File access mechanism
_asm_acd_chunks initial ACD chunks created
_asm_admin_with_sysdba Does the sysdba role have administrative privileges on ASM?
_asm_allow_appliance_dropdisk_noforce Allow DROP DISK/FAILUREGROUP NOFORCE on ASM Appliances
_asm_allow_lvm_resilvering Enable disk resilvering for external redundancy
_asm_allow_only_raw_disks Discovery only raw devices
_asm_allow_system_alias_rename if system alias renaming is allowed
_asm_allow_unsafe_reconnect attempt unsafe reconnect to ASM
_asm_allowdegeneratemounts Allow force-mounts of DGs w/o proper quorum
_asm_appliance_config_file Appliance configuration file name
_asm_ausize allocation unit size
_asm_automatic_rezone automatically rebalance free space across zones
_asm_avoid_pst_scans Avoid PST Scans
_asm_blksize metadata block size
_asm_check_for_misbehaving_cf_clients check for misbehaving CF-holding clients
_asm_compatibility default ASM compatibility level
_asm_dba_batch ASM Disk Based Allocation Max Batch Size
_asm_dba_spcchk_thld ASM Disk Based Allocation Space Check Threshold
_asm_dba_threshold ASM Disk Based Allocation Threshold
_asm_dbmsdg_nohdrchk dbms_diskgroup.checkfile does not check block headers
_asm_diag_dead_clients diagnostics for dead clients
_asm_direct_con_expire_time Expire time for idle direct connection to ASM instance
_asm_disable_amdu_dump Disable AMDU dump
_asm_disable_async_msgs disable async intra-instance messaging
_asm_disable_multiple_instance_check Disable checking for multiple ASM instances on a given node
_asm_disable_profilediscovery disable profile query for discovery
_asm_disable_smr_creation Do Not create smr
_asm_disable_ufg_dump disable terminated umbilicus diagnostic
_asm_disable_ufgmemberkill disable ufg member kill
_asm_disk_repair_time seconds to wait before dropping a failing disk
_asm_diskerr_traces Number of read/write errors per disk a process can trace
_asm_diskgroups2 disk groups to mount automatically set 2
_asm_diskgroups3 disk groups to mount automatically set 3
_asm_diskgroups4 disk groups to mount automatically set 4
_asm_emulate_nfs_disk Emulate NFS disk test event
_asm_emulmax max number of concurrent disks to emulate I /O errors
_asm_emultimeout timeout before emulation begins (in 3s ticks)
_asm_enable_xrov Enable XROV capability
_asm_evenread ASM Even Read level
_asm_evenread_alpha ASM Even Read Alpha
_asm_evenread_alpha2 ASM Even Read Second Alpha
_asm_evenread_faststart ASM Even Read Fast Start Threshold
_asm_fail_random_rx Randomly fail some RX enqueue gets
_asm_fob_tac_frequency Timeout frequency for FOB cleanup
_asm_force_quiesce Force diskgroup quiescing
_asm_global_dump_level System state dump level for ASM asserts
_asm_hbeatiowait number of secs to wait for PST Async Hbeat IO return
_asm_hbeatwaitquantum quantum used to compute time-to-wait for a PST Hbeat check
_asm_healthcheck_timeout seconds until health check takes action
_asm_imbalance_tolerance hundredths of a percentage of inter-disk imbalance to tolerate
_asm_instlock_quota ASM Instance Lock Quota
_asm_iostat_latch_count ASM I/O statistics latch count
_asm_kfdpevent KFDP event
_asm_kill_unresponsive_clients kill unresponsive ASM clients
_asm_libraries library search order for discovery
_asm_log_scale_rebalance Rebalance power uses logarithmic scale
_asm_lsod_bucket_size ASM lsod bucket size
_asm_max_cod_strides maximum number of COD strides
_asm_max_redo_buffer_size asm maximum redo buffer size
_asm_maxio Maximum size of individual I/O request
_asm_network_timeout Keepalive timeout for ASM network connections
_asm_networks ASM network subnet addresses
_asm_nodekill_escalate_time secs until escalating to nodekill if fence incomplete
_asm_noevenread_diskgroups List of disk groups having even read disabled
_asm_partner_target_disk_part target maximum number of disk partners for repartnering
_asm_partner_target_fg_rel target maximum number of failure group relationships for repartnering
_asm_primary_load Number of cycles/extents to load for non-mirrored files
_asm_primary_load_cycles True if primary load is in cycles, false if extent counts
_asm_procs_trace_diskerr Number of processes allowed to trace a disk failure
_asm_proxy_startwait Maximum time to wait for ASM proxy connection
_asm_random_zone Random zones for new files
_asm_rebalance_plan_size maximum rebalance work unit
_asm_rebalance_space_errors number of out of space errors allowed before aborting rebalance
_asm_remote_client_timeout timeout before killing disconnected remote clients
_asm_repairquantum quantum (in 3s) used to compute elapsed time for disk drop
_asm_reserve_slaves reserve ASM slaves for CF txns
_asm_resyncCkpt number of extents to resync before flushing checkpoint
_asm_root_directory ASM default root directory
_asm_runtime_capability_volume_support runtime capability for volume support returns supported
_asm_scrub_limit ASM disk scrubbing power
_asm_secondary_load Number of cycles/extents to load for mirrored files
_asm_secondary_load_cycles True if secondary load is in cycles, false if extent counts
_asm_serialize_volume_rebalance Serialize volume rebalance
_asm_shadow_cycle Inverse shadow cycle requirement
_asm_skip_diskval_check skip client side discovery for disk revalidate
_asm_skip_rename_check skip the checking of the clients for s/w compatibility for rename
_asm_skip_resize_check skip the checking of the clients for s/w compatibility for resize
_asm_storagemaysplit PST Split Possible
_asm_stripesize ASM file stripe size
_asm_stripewidth ASM file stripe width
_asm_sync_rebalance Rebalance uses sync I/O
_asm_trace_limit_timeout Time-out in milliseconds to reset the number of traces per disk and the number o
f processes allowed to trace
_asm_usd_batch ASM USD Update Max Batch Size
_asm_wait_time Max/imum time to wait before asmb exits
_asmsid ASM instance id
_assm_default ASSM default
_assm_force_fetchmeta enable metadata block fetching in ASSM segment scan
_assm_high_gsp_threshold Number of blocks rejected before growing segment
_assm_low_gsp_threshold Number of blocks rejected before collecting stats
_async_recovery_claims if TRUE, issue recovery claims asynchronously
_async_recovery_reads if TRUE, issue recovery reads asynchronously
_async_ts_threshold check tablespace thresholds asynchronously
_auto_assign_cg_for_sessions auto assign CGs for sessions
_auto_bmr enable/disable Auto BMR
_auto_bmr_bg_time Auto BMR Process Run Time
_auto_bmr_fc_time Auto BMR Flood Control Time
_auto_bmr_pub_timeout Auto BMR Publish Timeout
_auto_bmr_req_timeout Auto BMR Requester Timeout
_auto_bmr_sess_threshold Auto BMR Request Session Threshold
_auto_bmr_sys_threshold Auto BMR Request System Threshold
_auto_manage_enable_offline_check perodically check for OFFLINE disks and attempt to ONLINE
_auto_manage_exadata_disks Automate Exadata disk management
_auto_manage_infreq_tout TEST: Set infrequent timeout action to run at this interval, unit is seconds
_auto_manage_ioctl_bufsz oss_ioctl buffer size, to read and respond to cell notifications
_auto_manage_max_online_tries Max. attempts to auto ONLINE an ASM disk
_auto_manage_num_pipe_msgs Max. number of out-standing msgs in the KXDAM pipe
_auto_manage_num_tries Num. tries before giving up on a automation operation
_auto_manage_online_tries_expire_time Allow Max. attempts to auto ONLINE an ASM disk after lapsing this time (unit in
seconds)
_automatic_maintenance_test Enable AUTOTASK Test Mode
_automemory_broker_interval memory broker statistics gathering interval for auto memory
_autotask_max_window Maximum Logical Maintenance Window Length in minutes
_autotask_min_window Minimum Maintenance Window Length in minutes
_autotask_test_name Name of current Autotask Test (or test step)
_autotune_gtx_idle_time idle time to trigger auto-shutdown a gtx background process
_autotune_gtx_interval interval to autotune global transaction background processes
_autotune_gtx_threshold auto-tune threshold for degree of global transaction concurrency
_aux_dfc_keep_time auxiliary datafile copy keep time in minutes
_available_core_count number of cores for this instance
_avoid_prepare if TRUE, do not prepare a buffer when the master is local
_awr_cdbperf_threshold Setting for AWR CDBPERF Threshold
_awr_corrupt_mode AWR Corrupt Mode
_awr_disabled_flush_tables Disable flushing of specified AWR tables
_awr_flush_threshold_metrics Enable/Disable Flushing AWR Threshold Metrics
_awr_flush_workload_metrics Enable/Disable Flushing AWR Workload Metrics
_awr_mmon_cpuusage Enable/disable AWR MMON CPU Usage Tracking
_awr_mmon_deep_purge_all_expired Allows deep purge to purge AWR data for all expired snapshots
_awr_mmon_deep_purge_extent Set extent of rows to check each deep purge run
_awr_mmon_deep_purge_interval Set interval for deep purge of AWR contents
_awr_mmon_deep_purge_numrows Set max number of rows per table to delete each deep purge run
_awr_pdb_registration_enabled Parameter to enable/disable AWR PDB Registration
_awr_remote_target_dblink AWR Remote Target DBLink for Flushing
_awr_restrict_mode AWR Restrict Mode
_awr_sql_child_limit Setting for AWR SQL Child Limit
_b_tree_bitmap_plans enable the use of bitmap plans for tables w. only B-tree indexes
_backup_align_write_io align backup write I/Os
_backup_automatic_retry automatic retry on backup write errors
_backup_disk_bufcnt number of buffers used for DISK channels
_backup_disk_bufsz size of buffers used for DISK channels
_backup_disk_io_slaves BACKUP Disk I/O slaves
_backup_dynamic_buffers dynamically compute backup/restore buffer sizes
_backup_encrypt_opt_mode specifies encryption block optimization mode
_backup_file_bufcnt number of buffers used for file access
_backup_file_bufsz size of buffers used for file access
_backup_io_pool_size memory to reserve from the large pool
_backup_kgc_blksiz specifies buffer size to be used by HIGH compression
_backup_kgc_bufsz specifies buffer size to be used by BASIC compression
_backup_kgc_memlevel specifies memory level for MEDIUM compression
_backup_kgc_niters specifies number of iterations done by BASIC compression
_backup_kgc_perflevel specifies compression (performance) level for MEDIUM compression
_backup_kgc_scheme specifies compression scheme
_backup_kgc_type specifies compression type used by kgc BASIC compression
_backup_kgc_windowbits specifies window size for MEDIUM compression
_backup_ksfq_bufcnt number of buffers used for backup/restore
_backup_ksfq_bufmem_max maximum amount of memory (in bytes) used for buffers for backup/restore
_backup_ksfq_bufsz size of buffers used for backup/restore
_backup_lzo_size specifies buffer size for LOW compression
_backup_max_gap_size largest gap in an incremental/optimized backup buffer, in bytes
_backup_min_ct_unused_optim mimimun size in bytes of change tracking to apply unused space optimuzation
_backup_seq_bufcnt number of buffers used for non-DISK channels
_backup_seq_bufsz size of buffers used for non-DISK channels
_bct_bitmaps_per_file number of bitmaps to store for each datafile
_bct_buffer_allocation_max maximum size of all change tracking buffer allocations, in bytes
_bct_buffer_allocation_min_extents mininum number of extents to allocate per buffer allocation
_bct_buffer_allocation_size size of one change tracking buffer allocation, in bytes
_bct_chunk_size change tracking datafile chunk size, in bytes
_bct_crash_reserve_size change tracking reserved crash recovery SGA space, in bytes
_bct_file_block_size block size of change tracking file, in bytes
_bct_file_extent_size extent size of change tracking file, in bytes
_bct_fixtab_file change tracking file for fixed tables
_bct_health_check_interval CTWR health check interval (seconds), zero to disable
_bct_initial_private_dba_buffer_size initial number of entries in the private change tracking dba buffers
_bct_mrp_timeout CTWR MRP wait timeout (seconds), zero to wait forever
_bct_public_dba_buffer_dynresize allow dynamic resizing of public dba buffers, zero to disable
_bct_public_dba_buffer_maxsize max buffer size permitted for public dba buffers, in bytes
_bct_public_dba_buffer_size total size of all public change tracking dba buffers, in bytes
_bg_spawn_diag_opts background processes spawn diagnostic options
_bitmap_or_improvement_enabled controls extensions to partition pruning for general predicates
_block_level_offload_high_lat_thresh High Latency Threshold for Block Level Offload operations
_block_sample_readahead_prob_threshold controls readahead value during block sampling
_blocking_sess_graph_cache_size blocking session graph cache size in bytes
_blocks_per_cache_server number of consecutive blocks per global cache server
_bloom_filter_debug debug level for bloom filtering
_bloom_filter_enabled enables or disables bloom filter
_bloom_filter_size bloom filter vector size (in KB)
_bloom_folding_density bloom filter folding density lower bound
_bloom_folding_enabled Enable folding of bloom filter
_bloom_folding_min bloom filter folding size lower bound (in KB)
_bloom_max_size maximum bloom filter size (in KB)
_bloom_minmax_enabled enable or disable bloom min max filtering
_bloom_predicate_enabled enables or disables bloom filter predicate pushdown
_bloom_predicate_offload enables or disables bloom filter predicate offload to cells
_bloom_pruning_enabled Enable partition pruning using bloom filtering
_bloom_pushing_max bloom filter pushing size upper bound (in KB)
_bloom_pushing_total_max bloom filter combined pushing size upper bound (in KB)
_bloom_rm_filter remove bloom predicate in favor of zonemap join pruning predicate
_bloom_sm_enabled enable bloom filter optimization using slave mapping
_branch_tagging enable branch tagging for distributed transaction
_broadcast_scn_mode broadcast-on-commit scn mode
_broadcast_scn_wait_timeout broadcast-on-commit scn wait timeout in centiseconds
_bsln_adaptive_thresholds_enabled Adaptive Thresholds Enabled
_bt_mmv_query_rewrite_enabled allow rewrites with multiple MVs and base tables
_buffer_busy_wait_timeout buffer busy wait time in centiseconds
_buffered_message_spill_age Buffered message spill age
_buffered_publisher_flow_control_thresho Flow control threshold for buffered publishers except capture
ld
_bufq_stop_flow_control Stop enforcing flow control for buffered queues
_build_deferred_mv_skipping_mvlog_update DEFERRED MV creation skipping MV log setup update
_bump_highwater_mark_count how many blocks should we allocate per free list on advancing HWM
_bwr_for_flushed_pi if TRUE, generate a BWR for a flushed PI
_bypass_srl_for_so_eor bypass SRL for S/O EOR logs
_bypass_xplatform_error bypass datafile header cross-platform-compliance errors
_cache_orl_during_open cache online logs
_cache_stats_monitor if TRUE, enable cache stats monitoring
_capture_buffer_size To set the size of the PGA I/O recording buffers
_capture_publisher_flow_control_threshol Flow control threshold for capture publishers
d
_case_sensitive_logon case sensitive logon enabled
_causal_standby_wait_timeout Causal standby wait timeout
_cdb_compatible CDB Compatible
_cdb_rac_affinity rac affinity for parallel cdb operations
_cdc_subscription_owner Change Data Capture subscription_owner
_cdmp_diagnostic_level cdmp directory diagnostic level
_cell_fast_file_create Allow optimized file creation path for Cells
_cell_fast_file_restore Allow optimized rman restore for Cells
_cell_file_format_chunk_size Cell file format chunk size in MB
_cell_index_scan_enabled enable CELL processing of index FFS
_cell_materialize_all_expressions Force materialization of all offloadable expressions on the cells
_cell_materialize_virtual_columns enable offload of expressions underlying virtual columns to cells
_cell_offload_capabilities_enabled specifies capability table to load
_cell_offload_complex_processing enable complex SQL processing offload to cells
_cell_offload_expressions enable offload of expressions to cells
_cell_offload_hybridcolumnar Query offloading of hybrid columnar compressed tables to exadata
_cell_offload_predicate_reordering_enabl enable out-of-order SQL processing offload to cells
ed
_cell_offload_sys_context enable offload of SYS_CONTEXT evaluation to cells
_cell_offload_timezone enable timezone related SQL processing offload to cells
_cell_offload_virtual_columns enable offload of predicates on virtual columns to cells
_cell_range_scan_enabled enable CELL processing of index range scans
_cell_storidx_mode Cell Storage Index mode
_cgs_allgroup_poll_time CGS DBALL group polling interval in milli-seconds
_cgs_comm_readiness_check CGS communication readiness check
_cgs_dball_group_registration CGS DBALL group registration type
_cgs_dbgroup_poll_time CGS DB group polling interval in milli-seconds
_cgs_health_check_in_reconfig CGS health check during reconfiguration
_cgs_memberkill_from_rim_instance allow a RIM instance to issue a CSS member kill
_cgs_msg_batch_size CGS message batch size in bytes
_cgs_msg_batching CGS message batching
_cgs_node_kill_escalation CGS node kill escalation to CSS
_cgs_node_kill_escalation_wait CGS wait time to escalate node kill to CSS in seconds
_cgs_reconfig_extra_wait CGS reconfiguration extra wait time for CSS in seconds
_cgs_reconfig_timeout CGS reconfiguration timeout interval
_cgs_send_timeout CGS send timeout value
_cgs_ticket_sendback CGS ticket active sendback percentage threshold
_cgs_tickets CGS messaging tickets
_cgs_zombie_member_kill_wait CGS zombie member kill wait time in seconds
_change_vector_buffers Number of change vector buffers for media recovery
_check_block_after_checksum perform block check after checksum if both are turned on
_check_block_new_invariant_for_flashback check block new invariant for flashback
_check_column_length check column length
_check_pdbid_in_redo Enable checking of pluggable database ID in redo
_check_ts_threshold check tablespace thresholds
_cleanout_shrcur_buffers if TRUE, cleanout shrcur buffers
_cleanup_rollback_entries no. of undo entries to apply per transaction cleanup
_cleanup_timeout timeout value for PMON cleanup
_cleanup_timeout_flags flags for PMON cleanup timeout
_clear_buffer_before_reuse Always zero-out buffer before reuse for security
_cli_cachebktalloc Percentage of memory to allocate
_client_enable_auto_unregister enable automatic unregister after a send fails with timeout
_client_ntfn_cleanup_interval interval after which dead client registration cleanup task repeats
_client_ntfn_pinginterval time between pings to unreachable notification clients
_client_ntfn_pingretries number of times to ping unreachable notification clients
_client_ntfn_pingtimeout timeout to connect to unreachable notification clients
_client_result_cache_bypass bypass the client result cache
_client_tstz_error_check Should Client give error for suspect Timestamp with Timezone operations
_clone_one_pdb_recovery Recover ROOT and only one PDB in clone database
_close_cached_open_cursors close cursors cached by PL/SQL at each commit
_close_deq_by_cond_curs Close Dequeue By Condition Cursors
_cloud_name gsm cloud name
_cluster_library cluster library selection
_clusterwide_global_transactions enable/disable clusterwide global transactions
_collapse_wait_history collapse wait history
_collect_tempundo_stats Collect Statistics v$tempundostat
_collect_undo_stats Collect Statistics v$undostat
_column_compression_factor Column compression ratio
_column_elimination_off turn off predicate-only column elimination
_column_tracking_level column usage tracking
_common_user_prefix Enforce restriction on a prefix of a Common User/Role/Profile name
_compilation_call_heap_extent_size Size of the compilation call heaps extents
_complex_view_merging enable complex view merging
_compression_above_cache number of recompression above cache for sanity check
_compression_advisor Compression advisor
_compression_chain percentage of chained rows allowed for Compression
_compression_compatibility Compression compatability
_concurrency_chosen what is the chosen value of concurrency
_connect_by_use_union_all use union all for connect by
_connection_broker_host connection broker host for listen address
_controlfile_autobackup_delay time delay (in seconds) for performing controlfile autobackups
_controlfile_backup_copy_check enable check of the copied blocks during controlfile backup copy
_controlfile_block_size control file block size in bytes
_controlfile_cell_flash_caching Flash cache hint for control file accesses
_controlfile_enqueue_dump dump the system states after controlfile enqueue timeout
_controlfile_enqueue_holding_time control file enqueue max holding time in seconds
_controlfile_enqueue_holding_time_tracki control file enqueue holding time tracking size
ng_size
_controlfile_enqueue_timeout control file enqueue timeout in seconds
_controlfile_section_init_size control file initial section size
_controlfile_section_max_expand control file max expansion rate
_controlfile_update_check controlfile update sanity check
_convert_set_to_join enables conversion of set operator to join
_coord_message_buffer parallel recovery coordinator side extra message buffer size
_corrupted_rollback_segments corrupted undo segment list
_cost_equality_semi_join enables costing of equality semi-join
_cp_num_hash_latches connection pool number of hash latches
_cpu_eff_thread_multiplier CPU effective thread multiplier
_cpu_to_io divisor for converting CPU cost to I/O cost
_cr_grant_global_role if TRUE, grant lock for CR requests when block is in global role
_cr_grant_local_role turn 3-way CR grants off, make it automatic, or turn it on
_cr_grant_only if TRUE, grant locks when possible and do not send the block
_cr_server_log_flush if TRUE, flush redo log before serving a CR buffer
_cr_trc_buf_size size of cr trace buffer
_crash_domain_on_exception allow domain to exit for exceptions in any thread
_create_stat_segment create ilm statistics segment
_create_table_in_any_cluster allow creation of table in a cluster not owned by the user
_ctx_doc_policy_stems enable ctx_doc.policy_stems api
_cu_row_locking CU row level locking
_cursor_bind_capture_area_size maximum size of the cursor bind capture area
_cursor_bind_capture_interval interval (in seconds) between two bind capture for a cursor
_cursor_cache_time number of seconds a session cached cursor stay in cache.
_cursor_db_buffers_pinned additional number of buffers a cursor can pin at once
_cursor_features_enabled Shared cursor features enabled bits.
_cursor_obsolete_threshold Number of cursors per parent before obsoletion.
_cursor_plan_enabled enable collection and display of cursor plans
_cursor_plan_hash_version version of cursor plan hash value
_cursor_plan_unparse_enabled enables/disables using unparse to build projection/predicates
_cursor_reload_failure_threshold Number of failed reloads before marking cursor unusable
_cursor_runtimeheap_memlimit Shared cursor runtime heap memory limit
_cursor_stats_enabled Enable cursor stats
_cvmap_buffers Number of change vector buffers for multi instance media recovery
_cvw_enable_weak_checking enable weak view checking
_data_transfer_cache_bc_perc_x100 Percentange * 100 of buffer cache to transfer to data transfer cache
_data_transfer_cache_size Size of data transfer cache
_data_warehousing_scan_buffers if TRUE, enable data warehousing scan buffers
_datafile_cow Use copy on write snapshot for the renamed file
_datafile_write_errors_crash_instance datafile write errors crash instance
_datapump_compressbas_buffer_size specifies buffer size for BASIC compression algorithm
_datapump_metadata_buffer_size specifies buffer size for metadata file I/O
_datapump_tabledata_buffer_size specifies buffer size for table data file I/O
_db_16k_flash_cache_file flash cache file for 16k block size
_db_16k_flash_cache_size flash cache size for _db_16k_flash_cache_file
_db_2k_flash_cache_file flash cache file for 2k block size
_db_2k_flash_cache_size flash cache size for _db_2k_flash_cache_file
_db_32k_flash_cache_file flash cache file for 32k block size
_db_32k_flash_cache_size flash cache size for _db_32k_flash_cache_file
_db_4k_flash_cache_file flash cache file for 4k block size
_db_4k_flash_cache_size flash cache size for _db_4k_flash_cache_file
_db_8k_flash_cache_file flash cache file for 8k block size
_db_8k_flash_cache_size flash cache size for _db_8k_flash_cache_file
_db_aging_cool_count Touch count set when buffer cooled
_db_aging_freeze_cr Make CR buffers always be too cold to keep in cache
_db_aging_hot_criteria Touch count which sends a buffer to head of replacement list
_db_aging_stay_count Touch count set when buffer moved to head of replacement list
_db_aging_touch_time Touch count which sends a buffer to head of replacement list
_db_always_check_system_ts Always perform block check and checksum for System tablespace
_db_block_adjcheck adjacent cache buffer checks - low blkchk overwrite parameter
_db_block_adjchk_level adjacent cache buffer check level
_db_block_align_direct_read Align Direct Reads
_db_block_bad_write_check enable bad write checks
_db_block_buffers Number of database blocks cached in memory: hidden parameter
_db_block_cache_clone Always clone data blocks on get (for debugging)
_db_block_cache_history buffer header tracing (non-zero only when debugging)
_db_block_cache_history_level buffer header tracing level
_db_block_cache_history_lru buffer header tracing for lru operations
_db_block_cache_num_umap number of unmapped buffers (for tracking swap calls on blocks)
_db_block_cache_protect protect database blocks (true only when debugging)
_db_block_cache_protect_internal protect database blocks (for strictly internal use only)
_db_block_check_for_debug Check more and dump block before image for debugging
_db_block_check_objtyp check objd and typ on cache disk read
_db_block_chunkify_ncmbr chunkify noncontig multi block reads
_db_block_corruption_recovery_threshold threshold number of block recovery attempts
_db_block_do_full_mbreads do full block read even if some blocks are in cache
_db_block_hash_buckets Number of database block hash buckets
_db_block_hash_latches Number of database block hash latches
_db_block_header_guard_level number of extra buffer headers to use as guard pages
_db_block_hi_priority_batch_size Fraction of writes for high priority reasons
_db_block_known_clean_pct Initial Percentage of buffers to maintain known clean
_db_block_lru_latches number of lru latches
_db_block_max_cr_dba Maximum Allowed Number of CR buffers per dba
_db_block_max_scan_pct Percentage of buffers to inspect when looking for free
_db_block_med_priority_batch_size Fraction of writes for medium priority reasons
_db_block_numa Number of NUMA nodes
_db_block_prefetch_fast_longjumps_enable Batched IO enable fast longjumps
d
_db_block_prefetch_limit Prefetch limit in blocks
_db_block_prefetch_override Prefetch force override in blocks
_db_block_prefetch_private_cache_enabled Batched IO enable private cache
_db_block_prefetch_quota Prefetch quota as a percent of cache size
_db_block_prefetch_skip_reading_enabled Batched IO enable skip reading buffers
_db_block_prefetch_wasted_threshold_perc Allowed wasted percent threshold of prefetched size
_db_block_table_scan_buffer_size Size of shared table scan read buffer
_db_block_temp_redo generate redo for temp blocks
_db_block_trace_protect trace buffer protect calls
_db_block_vlm_check check of rvlm mapping leaks (for debugging)
_db_block_vlm_leak_threshold Threshold for allowable vlm leaks
_db_blocks_per_hash_latch Number of blocks per hash latch
_db_cache_advice_max_size_factor cache advisory maximum multiple of current size to similate
_db_cache_advice_sample_factor cache advisory sampling factor
_db_cache_advice_sanity_check cache simulation sanity check
_db_cache_block_read_stack_trace dump short call stack for block reads
_db_cache_crx_check check for costly crx examination functions
_db_cache_miss_check_les check LEs after cache miss
_db_cache_mman_latch_check check for wait latch get under MMAN ops in kcb
_db_cache_pre_warm Buffer Cache Pre-Warm Enabled : hidden parameter
_db_cache_process_cr_pin_max maximum number of cr pins a process may have
_db_cache_wait_debug trace new kslwaits
_db_change_notification_enable enable db change notification
_db_check_cell_hints
_db_disable_temp_encryption Disable Temp Encryption for Spills
_db_dump_from_disk_and_efc dump contents from disk and efc
_db_dw_scan_adaptive_cooling if TRUE, enable adaptive DW scan cooling
_db_dw_scan_max_shadow_count DW Scan adaptive cooling max shadow count
_db_dw_scan_obj_cooling_factor DW Scan object cooling factor to cool all temperatures
_db_dw_scan_obj_cooling_interval DW Scan object cooling interval in number of scans, seconds, or pct of cache siz
e
_db_dw_scan_obj_cooling_policy DW scan objtect cooling policy
_db_dw_scan_obj_warming_increment DW Scan object warming increment when an object is scanned
_db_fast_obj_check enable fast object drop sanity check
_db_fast_obj_ckpt enable fast object checkpoint
_db_fast_obj_truncate enable fast object truncate
_db_file_direct_io_count Sequential I/O buf size
_db_file_exec_read_count multiblock read count for regular clients
_db_file_format_io_buffers Block formatting I/O buf count
_db_file_noncontig_mblock_read_count number of noncontiguous db blocks to be prefetched
_db_file_optimizer_read_count multiblock read count for regular clients
_db_flash_cache_force_replenish_limit Flash cache force replenish lower limit in buffers
_db_flash_cache_keep_limit Flash cache keep buffer upper limit in percentage
_db_flash_cache_max_latency Flash cache maximum latency allowed in 10 milliseconds
_db_flash_cache_max_outstanding_writes Flash cache maximum outstanding writes allowed
_db_flash_cache_max_read_retry Flash cache max read retry
_db_flash_cache_max_slow_io Flash cache maximum slow io allowed
_db_flash_cache_write_limit Flash cache write buffer upper limit in percentage
_db_flashback_iobuf_size Flashback IO Buffer Size
_db_flashback_log_min_size Minimum flashback database log size in bytes
_db_flashback_log_min_total_space Minimum flashback database log total space in bytes
_db_flashback_num_iobuf Flashback Number of IO buffers
_db_handles System-wide simultaneous buffer operations
_db_handles_cached Buffer handles cached each process
_db_hot_block_tracking track hot blocks for hash latch contention
_db_index_block_checking index block checking override parameter
_db_initial_cachesize_create_mb size of cache created at startup
_db_l2_tracing flash cache debug tracing
_db_large_dirty_queue Number of buffers which force dirty queue to be written
_db_lost_write_checking Enable scn based lost write detection mechanism
_db_lost_write_tracing Enable _db_lost_write_checking tracing
_db_mttr_advice MTTR advisory
_db_mttr_partitions number of partitions for MTTR advisory
_db_mttr_sample_factor MTTR simulation sampling factor
_db_mttr_sim_target MTTR simulation targets
_db_mttr_sim_trace_size MTTR simulation trace size
_db_mttr_trace_to_alert dump trace entries to alert file
_db_noarch_disble_optim Image redo logging (NOARCHIVEMODE)
_db_num_evict_waitevents number of evict wait events
_db_num_gsm database number in gsm dbpool
_db_obj_enable_ksr enable ksr in object checkpoint/reuse
_db_percent_hot_default Percent of default buffer pool considered hot
_db_percent_hot_keep Percent of keep buffer pool considered hot
_db_percent_hot_recycle Percent of recycle buffer pool considered hot
_db_percpu_create_cachesize size of cache created per cpu in deferred cache create
_db_prefetch_histogram_statistics maintain prefetch histogram statistics in x$kcbprfhs
_db_recovery_temporal_file_dest default database recovery temporal file location
_db_required_percent_fairshare_usage percent of fairshare a processor group should always use
_db_row_overlap_checking row overlap checking override parameter for data/index blocks
_db_todefer_cache_create buffer cache deferred create
_db_writer_chunk_writes Number of writes DBWR should wait for
_db_writer_coalesce_area_size Size of memory allocated to dbwriter for coalescing writes
_db_writer_coalesce_write_limit Limit on size of coalesced write
_db_writer_flush_imu If FALSE, DBWR will not downgrade IMU txns for AGING
_db_writer_histogram_statistics maintain dbwr histogram statistics in x$kcbbhs
_db_writer_max_writes Max number of outstanding DB Writer IOs
_db_writer_nomemcopy_coalesce Enable DBWR no-memcopy coalescing
_db_writer_verify_writes Enable lost write detection mechanism
_dbfs_modify_implicit_fetch DBFS Link allows implicit fetch on modify - only on SecureFiles
_dbg_proc_startup debug process startup
_dbg_scan generic scan debug
_dbms_sql_security_level Security level in DBMS_SQL
_dbop_enabled Any positive number enables automatic DBOP monitoring. 0 is disabled
_dbpool_name gsm database pool name
_dbrm_dynamic_threshold DBRM dynamic threshold setting
_dbrm_num_runnable_list Resource Manager number of runnable list per NUMA node
_dbrm_quantum DBRM quantum
_dbrm_runchk Resource Manager Diagnostic Running Thread Check
_dbrm_short_wait_us Resource Manager short wait length
_dbwr_async_io Enable dbwriter asynchronous writes
_dbwr_scan_interval dbwriter scan interval
_dbwr_tracing Enable dbwriter tracing
_dd_validate_remote_locks GES deadlock detection validate remote locks
_dde_flood_control_init Initialize Flood Control at database open
_dead_process_scan_interval PMON dead process scan interval (in seconds)
_deadlock_diagnostic_level automatic deadlock resolution diagnostics level
_deadlock_record_to_alert_log record resolved deadlocks to the alert log
_deadlock_resolution_incidents_always create incidents when resolving any deadlock?
_deadlock_resolution_incidents_enabled create incidents during deadlock resolution
_deadlock_resolution_level automatic deadlock resolution level
_deadlock_resolution_min_wait_timeout_se the minimum wait timeout required for deadlock resolution
cs
_deadlock_resolution_signal_process_thre the amount of time given to process a deadlock resolution signal
sh_secs
_dedicated_server_poll_count dedicated server poll count
_dedicated_server_post_wait dedicated server post/wait
_dedicated_server_post_wait_call dedicated server post/wait call
_default_encrypt_alg default encryption algorithm
_default_non_equality_sel_check sanity check on default selectivity for like/range predicate
_defer_eor_orl_arch_for_so defer EOR ORL archival for switchover
_defer_log_boundary_ckpt defer media recovery checkpoint at log boundary
_defer_log_count Number of log boundaries media recovery checkpoint lags behind
_defer_rcv_during_sw_to_sby Defer recovery during switchover to standby
_defer_sga_alloc_chunk_size Chunk size for defer sga allocation
_defer_sga_enabled Enable deferred shared memory allocation for SGA
_defer_sga_min_spsz_at_startup Minimum shared pool size at startup with deferred sga enabled
_defer_sga_min_total_defer_segs_sz Minimum total deferred segs size for defer sga allocation
_defer_sga_test_alloc_intv SA** sleeps for N secs before allocating a deferred segment
_deferred_constant_folding_mode Deferred constant folding mode
_deferred_log_dest_is_valid consider deferred log dest as valid for log deletion (TRUE/FALSE)
_deferred_seg_in_seed Enable Deferred Segment Creation in Seed
_delay_index_maintain delays index maintenance until after MV is refreshed
_delta_push_share_blockers enable delta push if greater than the # of share blockers
_deq_execute_reset_time deq execute reset time
_deq_ht_child_latches deq ht child latches
_deq_ht_max_elements deq ht max elements
_deq_large_txn_size deq large txn size
_deq_log_array_size deq log array size
_deq_max_fetch_count deq max fetch count
_deq_maxwait_time Change wait times between dequeue calls
_desired_readmem_rate The desired percentage of redo reading from memory
_dg_broker_trace_level data guard broker trace level
_dg_cf_check_timer Data Guard controlfile check timer
_dg_corrupt_redo_log Corrupt redo log validation during archivals
_diag_adr_auto_purge Enable/disable ADR MMON Auto Purging
_diag_adr_enabled Parameter to enable/disable Diag ADR
_diag_adr_test_param Test parameter for Diagnosability
_diag_arb_before_kill dump diagnostics before killing unresponsive ARBs
_diag_backward_compat Backward Compatibility for Diagnosability
_diag_cc_enabled Parameter to enable/disable Diag Call Context
_diag_conf_cap_enabled Parameter to enable/disable Diag Configuration Capture
_diag_crashdump_level parameter for systemstate dump level, used by DIAG during crash
_diag_daemon start DIAG daemon
_diag_dde_async_age_limit diag dde async actions: message age limit (in seconds)
_diag_dde_async_cputime_limit diag dde async actions: action cputime limit (in seconds)
_diag_dde_async_mode diag dde async actions: dispatch mode
_diag_dde_async_msg_capacity diag dde async actions: message buffer capacity
_diag_dde_async_msgs diag dde async actions: number of preallocated message buffers
_diag_dde_async_process_rate diag dde async actions: message processing rate - per loop
_diag_dde_async_runtime_limit diag dde async actions: action runtime limit (in seconds)
_diag_dde_async_slaves diag dde async actions: max number of concurrent slave processes
_diag_dde_enabled enable DDE handling of critical errors
_diag_dde_fc_enabled Parameter to enable/disable Diag Flood Control
_diag_dde_fc_implicit_time Override Implicit Error Flood Control time parameter
_diag_dde_fc_macro_time Override Macro Error Flood Control time parameter
_diag_dde_inc_proc_delay The minimum delay between two MMON incident sweeps (minutes)
_diag_diagnostics Turn off diag diagnostics
_diag_dump_request_debug_level DIAG dump request debug level (0-2)
_diag_dump_timeout timeout parameter for SYNC dump
_diag_enable_startup_events enable events in instance startup notifiers
_diag_hm_rc_enabled Parameter to enable/disable Diag HM Reactive Checks
_diag_hm_tc_enabled Parameter to enable/disable Diag HM Test(dummy) Checks
_diag_proc_enabled enable hung process diagnostic API
_diag_proc_max_time_ms hung process diagnostic API max wait time in milliseconds
_diag_proc_stack_capture_type hung process diagnostic API stack capture type
_diag_test_seg_reinc_mode Sets trace segmentation to be in reincarnation mode
_diag_uts_control UTS control parameter
_diag_verbose_error_on_init Allow verbose error tracing on diag init
_diag_xm_enabled If TRUE, DIAG allows message exchanges across DB/ASM boundary
_dimension_skip_null control dimension skip when null feature
_direct_io_skip_cur_slot_on_error Skip current slot on error
_direct_io_slots number of slots for direct path I/O
_direct_io_wslots number of write slots for direct path I/O
_direct_path_insert_features disable direct path insert features
_direct_read_decision_statistics_driven enable direct read decision based on optimizer statistics
_disable_12751 disable policy timeout error (ORA-12751)
_disable_12cbigfile DIsable Storing ILM Statistics in 12cBigFiles
_disable_active_influx_move disable active influx move during parallel media recovery
_disable_adaptive_shrunk_aggregation adaptive shrunk aggregation
_disable_appliance_check Disable appliance-specific code
_disable_appliance_partnering Disable appliance partnering algorithms
_disable_autotune_gtx disable autotune global transaction background processes
_disable_block_checking disable block checking at the session level
_disable_cell_optimized_backups disable cell optimized backups
_disable_cpu_check disable cpu_count check
_disable_cursor_sharing disable cursor sharing
_disable_datalayer_sampling disable datalayer sampling
_disable_directory_link_check Disable directory link checking
_disable_duplex_link Turn off connection duplexing
_disable_fast_aggregation fast aggregation
_disable_fast_validate disable PL/SQL fast validation
_disable_fastopen Do Not Use Fastopen
_disable_fba_qrw disable flashback archiver query rewrite
_disable_fba_wpr disable flashback archiver wait for prepared transactions
_disable_file_locks disable file locks for control, data, redo log files
_disable_flashback_archiver disable flashback archiver
_disable_flashback_recyclebin_opt Don't use the Flashback Recyclebin optimization
_disable_flashback_wait_callback Disable flashback wait callback
_disable_function_based_index disable function-based index matching
_disable_gvaq_cache Disable cache
_disable_health_check Disable Health Check
_disable_highres_ticks disable high-res tick counter
_disable_image_check Disable Oracle executable image checking
_disable_implicit_row_movement disable implicit row movement
_disable_incremental_checkpoints Disable incremental checkpoints for thread recovery
_disable_incremental_recovery_ckpt Disable incremental recovery checkpoint mechanism
_disable_index_block_prefetching disable index block prefetching
_disable_initial_block_compression disable initial block compression
_disable_instance_params_check disable instance type check for ksp
_disable_interface_checking disable interface checking at startup
_disable_kcb_flashback_blocknew_opt Disable KCB flashback block new optimization
_disable_kcbhxor_osd disable kcbh(c)xor OSD functionality
_disable_kcbl_flashback_blocknew_opt Disable KCBL flashback block new optimization
_disable_kgghshcrc32_osd disable kgghshcrc32chk OSD functionality
_disable_latch_free_SCN_writes_via_32cas disable latch-free SCN writes using 32-bit compare & swap
_disable_latch_free_SCN_writes_via_64cas disable latch-free SCN writes using 64-bit compare & swap
_disable_logging Disable logging
_disable_metrics_group Disable Metrics Group (or all Metrics Groups)
_disable_multiple_block_sizes disable multiple block size support (for debugging)
_disable_odm disable odm feature
_disable_parallel_conventional_load Disable parallel conventional loads
_disable_primary_bitmap_switch disable primary bitmap switch
_disable_read_only_open_dict_check Disable read-only open dictionary check
_disable_rebalance_space_check disable space usage checks for storage reconfiguration
_disable_recovery_read_skip Disable the read optimization during media recovery
_disable_rolling_patch Disable Rolling Patch Feature
_disable_sample_io_optim disable row sampling IO optimization
_disable_savepoint_reset disable the fix for bug 1402161
_disable_selftune_checkpointing Disable self-tune checkpointing
_disable_storage_type Disable storage type checks
_disable_streams_diagnostics streams diagnostics
_disable_streams_pool_auto_tuning disable streams pool auto tuning
_disable_sun_rsm Disable IPC OSD support for Sun RSMAPI
_disable_system_state disable system state dump
_disable_system_state_wait_samples Disable system state dump - wait samples
_disable_temp_tablespace_alerts disable tablespace alerts for TEMPORARY tablespaces
_disable_thread_internal_disable Disable thread internal disable feature
_disable_thread_snapshot Thread snapshot
_disable_txn_alert disable txn layer alert
_disable_undo_tablespace_alerts disable tablespace alerts for UNDO tablespaces
_disable_wait_state Disable wait state
_discrete_transactions_enabled enable OLTP mode
_disk_sector_size_override if TRUE, OSD sector size could be overridden
_diskmon_pipe_name DiSKMon skgznp pipe name
_dispatcher_rate_scale scale to display rate statistic (100ths of a second)
_dispatcher_rate_ttl time-to-live for rate statistic (100ths of a second)
_distinct_view_unnesting enables unnesting of in subquery into distinct view
_distributed_recovery_connection_hold_ti number of seconds RECO holds outbound connections open
me
_dlmtrace Trace string of global enqueue type(s)
_dm_dmf_details_compatibility set dm dmf details compatibility version
_dm_enable_legacy_dmf_output_types revert dmf output types to pre-12.1.0.1
_dm_max_shared_pool_pct max percentage of the shared pool to use for a mining model
_dml_batch_error_limit number or error handles allocated for DML in batch mode
_dml_frequency_tracking Control DML frequency tracking
_dml_frequency_tracking_advance Control automatic advance and broadcast of DML frequencies
_dml_frequency_tracking_slot_time Time length of each slot for DML frequency tracking
_dml_frequency_tracking_slots Number of slots to use for DML frequency tracking
_dml_monitoring_enabled enable modification monitoring
_dnfs_rdma_enable Enable dNFS RDMA transfers
_dnfs_rdma_max Maximum size of dNFS RDMA transfer
_dnfs_rdma_min Minimum size of dNFS RDMA transfer
_domain_index_batch_size maximum number of rows from one call to domain index fetch routine
_domain_index_dml_batch_size maximum number of rows for one call to domain index dml routines
_dra_bmr_number_threshold Maximum number of BMRs that can be done to a file
_dra_bmr_percent_threshold Maximum percentage of blocks in a file that can be BMR-ed
_dra_enable_offline_dictionary Enable the periodic creation of the offline dictionary for DRA
_drm_parallel_freeze if TRUE enables parallel drm freeze
_drop_flashback_logical_operations_enq Drop logical operations enqueue immediately during flashback marker generation
_drop_stat_segment drop ilm statistics segment
_drop_table_granule drop_table_granule
_drop_table_optimization_enabled reduce SGA memory use during drop of a partitioned table
_ds_enable_auto_txn Dynamic Sampling Service Autonomous Transaction control parameter
_ds_iocount_iosize Dynamic Sampling Service defaults: #IOs and IO Size
_ds_parse_model Dynamic Sampling Service Parse Model control parameter
_dsc_feature_level controls the feature level for deferred segment creation
_dskm_health_check_cnt DiSKMon health check counter
_dss_cache_flush enable full cache flush for parallel execution
_dtree_area_size size of Decision Tree Classification work area
_dtree_binning_enabled Decision Tree Binning Enabled
_dtree_bintest_id Decision Tree Binning Test ID
_dtree_compressbmp_enabled Decision Tree Using Compressed Bitmaps Enabled
_dtree_max_surrogates maximum number of surrogates
_dtree_pruning_enabled Decision Tree Pruning Enabled
_dummy_instance dummy instance started by RMAN
_dump_10261_level Dump level for event 10261, 1=>minimal dump 2=>top pga dump
_dump_common_subexpressions dump common subexpressions
_dump_connect_by_loop_data dump connect by loop error message into trc file
_dump_cursor_heap_sizes dump comp/exec heap sizes to tryace file
_dump_interval_limit trace dump time interval limit (in seconds)
_dump_max_limit max number of dump within dump interval
_dump_qbc_tree dump top level query parse tree to trace
_dump_rcvr_ipc if TRUE enables IPC dump at instance eviction time
_dump_scn_increment_stack Dumps scn increment stack per session
_dump_system_state_scope scope of sysstate dump during instance termination
_dump_trace_scope scope of trace dump during a process crash
_dynamic_rls_policies rls policies are dynamic
_dynamic_stats_threshold delay threshold (in seconds) between sending statistics messages
_eighteenth_spare_parameter eighteenth spare parameter - string
_eighth_spare_parameter eighth spare parameter - integer
_eleventh_spare_parameter eleventh spare parameter - integer
_eliminate_common_subexpr enables elimination of common sub-expressions
_emon_max_active_connections maximum open connections to clients per emon
_emon_outbound_connect_timeout timeout for completing connection set up to clients
_emon_pool_inc increment in EMON slaves per pool type
_emon_pool_max maximum number of EMON slaves per pool type
_emon_pool_min minimum number of EMON slaves per pool type
_emon_regular_ntfn_slaves number of EMON slaves doing regular database notifications
_emon_send_timeout send timeout after which the client is unregistered
_emx_control EM Express control (internal use only)
_emx_max_sessions Maximum number of sessions in the EM Express cache
_emx_session_timeout Session timeout (sec) in the EM Express cache
_enable_12g_bft enable 12g bigfile tablespace
_enable_Front_End_View_Optimization enable front end view optimization
_enable_LGPG_debug Enable LGPG debug mode
_enable_NUMA_interleave Enable NUMA interleave mode
_enable_NUMA_optimization Enable NUMA specific optimizations
_enable_NUMA_support Enable NUMA support and optimizations
_enable_asyncvio enable asynch vectored I/O
_enable_automatic_maintenance if 1, Automated Maintenance Is Enabled
_enable_automatic_sqltune Automatic SQL Tuning Advisory enabled parameter
_enable_block_level_transaction_recovery enable block level recovery
_enable_check_truncate enable checking of corruption caused by canceled truncate
_enable_columnar_cache Enable Columnar Flash Cache Rewrite
_enable_cscn_caching enable commit SCN caching for all transactions
_enable_ddl_wait_lock use this to turn off ddls with wait semantics
_enable_default_affinity enable default implementation of hard affinity osds
_enable_default_temp_threshold Enable Default Tablespace Utilization Threshold for UNDO Tablespaces
_enable_default_undo_threshold Enable Default Tablespace Utilization Threshold for TEMPORARY Tablespaces
_enable_dml_lock_escalation enable dml lock escalation against partitioned tables if TRUE
_enable_editions_for_users enable editions for all users
_enable_exchange_validation_using_check use check constraints on the table for validation
_enable_fast_ref_after_mv_tbs enable fast refresh after move tablespace
_enable_ffw FAL FORWARDING
_enable_flash_logging Enable Exadata Smart Flash Logging
_enable_hash_overflow TRUE - enable hash cluster overflow based on SIZE
_enable_heatmap_internal heatmap related - to be used by oracle dev only
_enable_hwm_sync enable HWM synchronization
_enable_iee_stats enables IEE stats gathering
_enable_ilm_flush_stats Enable ILM Stats Flush
_enable_ilm_testflush_stats Enable Test ILM Stats Flush
_enable_kqf_purge Enable KQF fixed runtime table purge
_enable_list_io Enable List I/O
_enable_midtier_affinity enable midtier affinity metrics processing
_enable_minscn_cr enable/disable minscn optimization for CR
_enable_nativenet_tcpip Enable skgxp driver usage for native net
_enable_obj_queues enable object queues
_enable_offloaded_writes Enable offloaded writes
_enable_online_index_without_s_locking Allow online index creation algorithm without S DML lock
_enable_pluggable_database Enable Pluggable Database
_enable_query_rewrite_on_remote_objs mv rewrite on remote table/view
_enable_redo_global_post LGWR post globally on write
_enable_refresh_schedule enable or disable MV refresh scheduling (revert to 9.2 behavior)
_enable_reliable_latch_waits Enable reliable latch waits
_enable_rename_user enable RENAME-clause using ALTER USER statement
_enable_rlb enable RLB metrics processing
_enable_row_shipping use the row shipping optimization for wide table selects
_enable_sb_detection Split Brain Detection
_enable_schema_synonyms enable DDL operations (e.g. creation) involving schema synonyms
_enable_scn_wait_interface use this to turn off scn wait interface in kta
_enable_securefile_flashback_opt Enable securefile flashback optimization
_enable_separable_transactions enable/disable separable transactions
_enable_shared_pool_durations temporary to disable/enable kgh policy
_enable_shared_server_vector_io Enable shared server vector I/O
_enable_space_preallocation enable space pre-allocation
_enable_spacebg enable space management background task
_enable_tablespace_alerts enable tablespace alerts
_enable_type_dep_selectivity enable type dependent selectivity estimates
_endprot_chunk_comment chunk comment for selective overrun protection
_endprot_heap_comment heap comment for selective overrun protection
_endprot_subheaps selective overrun protection for subeheaps
_enqueue_deadlock_detect_all_global_lock enable deadlock detection on all global enqueues
s
_enqueue_deadlock_scan_secs deadlock scan interval
_enqueue_deadlock_time_sec requests with timeout <= this will not have deadlock detection
_enqueue_debug_multi_instance debug enqueue multi instance
_enqueue_hash enqueue hash table length
_enqueue_hash_chain_latches enqueue hash chain latches
_enqueue_locks locks for managed enqueues
_enqueue_paranoia_mode_enabled enable enqueue layer advanced debugging checks
_enqueue_resources resources for enqueues
_enqueue_sync_retry_attempts max number of times the bg process to retry synchronous enqueue open if it faile
d because master could not allocate memory
_enqueue_sync_sim_mem_error simulate master instance running out of memory when synchronously getting a remo
tely mastered enqueue
_evolve_plan_baseline_report_level Level of detail to show in plan verification/evolution report
_evt_system_event_propagation disable system event propagation
_expand_aggregates expand aggregates
_explain_rewrite_mode allow additional messages to be generated during explain rewrite
_extended_pruning_enabled do runtime pruning in iterator if set to TRUE
_external_scn_logging_threshold_seconds High delta SCN threshold in seconds
_external_scn_rejection_delta_threshold_ external SCN rejection delta threshold in minutes
minutes
_external_scn_rejection_threshold_hours Lag in hours between max allowed SCN and an external SCN
_fair_remote_cvt if TRUE enables fair remote convert
_fairness_threshold number of times to CR serve before downgrading lock
_fast_cursor_reexecute use more memory in order to get faster execution
_fast_dual_enabled enable/disable fast dual
_fast_full_scan_enabled enable/disable index fast full scan
_fast_index_maintenance fast global index maintenance during PMOPs
_fast_psby_conversion Enable fast physical standby conversion
_fastpin_enable enable reference count based fast pins
_fbda_busy_percentage flashback archiver busy percentage
_fbda_debug_assert flashback archiver debug assert for testing
_fbda_debug_mode flashback archiver debug event for testing
_fbda_global_bscn_lag flashback archiver global barrier scn lag
_fbda_inline_percentage flashback archiver inline percentage
_fbda_rac_inactive_limit flashback archiver rac inactive limit
_fg_iorm_slaves ForeGround I/O slaves for IORM
_fg_log_checksum Checksum redo in foreground process
_fg_sync_sleep_usecs Log file sync via usleep
_fic_algorithm_set Set Frequent Itemset Counting Algorithm
_fic_area_size size of Frequent Itemset Counting work area
_fic_max_length Frequent Itemset Counting Maximum Itemset Length
_fic_min_bmsize Frequent Itemset Counting Minimum BITMAP Size
_fic_outofmem_candidates Frequent Itemset Counting Out Of Memory Candidates Generation
_fifteenth_spare_parameter fifteenth spare parameter - integer
_fifth_spare_parameter fifth spare parameter - integer
_file_size_increase_increment Amount of file size increase increment, in bytes
_filemap_dir FILEMAP directory
_first_k_rows_dynamic_proration enable the use of dynamic proration of join cardinalities
_first_spare_parameter first spare parameter - integer
_fix_control bug fix control parameter
_flashback_11.1_block_new_opt use 11.1 flashback block new optimization scheme
_flashback_allow_noarchivelog Allow enabling flashback on noarchivelog database
_flashback_archiver_partition_size flashback archiver table partition size
_flashback_barrier_interval Flashback barrier interval in seconds
_flashback_copy_latches Number of flashback copy latches
_flashback_database_test_only Run Flashback Database in test mode
_flashback_delete_chunk_MB Amount of flashback log (in MB) to delete in one attempt
_flashback_dynamic_enable enable flashback enable code path
_flashback_dynamic_enable_failure Simulate failures during dynamic enable
_flashback_enable_ra Flashback enable read ahead
_flashback_format_chunk_mb Chunk mega-bytes for formatting flashback logs using sync write
_flashback_format_chunk_mb_dwrite Chunk mega-bytes for formatting flashback logs using delayed write
_flashback_fuzzy_barrier Use flashback fuzzy barrier
_flashback_generation_buffer_size flashback generation buffer size
_flashback_hint_barrier_percent Flashback hint barrier percent
_flashback_log_io_error_behavior Specify Flashback log I/O error behavior
_flashback_log_min_size Minimum flashback log size
_flashback_log_rac_balance_factor flashback log rac balance factor
_flashback_log_size Flashback log size
_flashback_logfile_enqueue_timeout flashback logfile enqueue timeout for opens
_flashback_marker_cache_enabled Enable flashback database marker cache
_flashback_marker_cache_size Size of flashback database marker cache
_flashback_max_log_size Maximum flashback log size in bytes (OS limit)
_flashback_max_n_log_per_thread Maximum number of flashback logs per flashback thread
_flashback_max_standby_sync_span Maximum time span between standby recovery sync for flashback
_flashback_n_log_per_thread Desired number of flashback logs per flashback thread
_flashback_prepare_log Prepare Flashback logs in the background
_flashback_size_based_on_redo Size new flashback logs based on average redo log size
_flashback_standby_barrier_interval Flashback standby barrier interval in seconds
_flashback_validate_controlfile validate flashback pointers in controlfile for 11.2.0.2 database
_flashback_verbose_info Print verbose information about flashback database
_flashback_write_max_loop_limit Flashback writer loop limit before it returns
_flush_ilm_stats flush ilm stats
_flush_plan_in_awr_sql Plan is being flushed from an AWR flush SQL
_flush_redo_to_standby Flush redo to standby test event parameter
_flush_undo_after_tx_recovery if TRUE, flush undo buffers after TX recovery
_force_arch_compress Archive Compress all newly created compressed tables
_force_datefold_trunc force use of trunc for datefolding rewrite
_force_hash_join_spill force hash join to spill to disk
_force_hsc_compress compress all newly created tables
_force_logging_in_upgrade force logging during upgrade mode
_force_oltp_compress OLTP Compress all newly created compressed tables
_force_oltp_update_opt OLTP Compressed row optimization on update
_force_rcv_info_ping Force recovery info ping to stdby
_force_rewrite_enable control new query rewrite features
_force_slave_mapping_intra_part_loads Force slave mapping for intra partition loads
_force_sys_compress Sys compress
_force_temptables_for_gsets executes concatenation of rollups using temp tables
_force_tmp_segment_loads Force tmp segment loads
_forwarded_2pc_threshold auto-tune threshold for two-phase commit rate across RAC instances
_fourteenth_spare_parameter fourteenth spare parameter - integer
_fourth_spare_parameter fourth spare parameter - integer
_frame_cache_time number of seconds a cached frame page stay in cache.
_full_diag_on_rim rim nodes have full DIA* function
_full_pwise_join_enabled enable full partition-wise join when TRUE
_fusion_security Fusion Security
_gby_hash_aggregation_enabled enable group-by and aggregation using hash scheme
_gby_onekey_enabled enable use of one comparison of all group by keys
_gc_affinity_acquire_time if TRUE, save the time we acquired an affinity lock
_gc_affinity_locking if TRUE, enable object affinity
_gc_affinity_locks if TRUE, get affinity locks
_gc_affinity_ratio dynamic object affinity ratio
_gc_async_send send blocks asynchronously
_gc_bypass_readers if TRUE, modifications bypass readers
_gc_check_bscn if TRUE, check for stale blocks
_gc_coalesce_recovery_reads if TRUE, coalesce recovery reads
_gc_cpu_time if TRUE, record the gc cpu time
_gc_cr_server_read_wait if TRUE, cr server waits for a read to complete
_gc_defer_ping_index_only if TRUE, restrict deferred ping to index blocks only
_gc_defer_time how long to defer pings for hot buffers in milliseconds
_gc_delta_push_compression if delta >= K bytes, compress before push
_gc_delta_push_max_level max delta level for delta push
_gc_delta_push_objects objects which use delta push
_gc_disable_s_lock_brr_ping_check if TRUE, disable S lock BRR ping check for lost write protect
_gc_down_convert_after_keep if TRUE, down-convert lock after recovery
_gc_element_percent global cache element percent
_gc_escalate_bid if TRUE, escalates create a bid
_gc_fg_merge if TRUE, merge pi buffers in the foreground
_gc_fg_spin_time foreground msgq spin time
_gc_flush_during_affinity if TRUE, flush during affinity
_gc_fusion_compression compress fusion blocks if there is free space
_gc_global_checkpoint_scn if TRUE, enable global checkpoint scn
_gc_global_cpu global cpu checks
_gc_global_lru turn global lru off, make it automatic, or turn it on
_gc_global_lru_touch_count global lru touch count
_gc_global_lru_touch_time global lru touch time in seconds
_gc_integrity_checks set the integrity check level
_gc_keep_recovery_buffers if TRUE, make single instance crash recovery buffers current
_gc_latches number of latches per LMS process
_gc_log_flush if TRUE, flush redo log before a current block transfer
_gc_long_query_threshold threshold for long running query
_gc_max_downcvt maximum downconverts to process at one time
_gc_maximum_bids maximum number of bids which can be prepared
_gc_no_fairness_for_clones if TRUE, no fairness if we serve a clone
_gc_object_queue_max_length maximum length for an object queue
_gc_override_force_cr if TRUE, try to override force-cr requests
_gc_persistent_read_mostly if TRUE, enable persistent read-mostly locking
_gc_policy_minimum dynamic object policy minimum activity per minute
_gc_policy_time how often to make object policy decisions in minutes
_gc_read_mostly_flush_check if TRUE, optimize flushes for read mostly objects
_gc_read_mostly_locking if TRUE, enable read-mostly locking
_gc_sanity_check_cr_buffers if TRUE, sanity check CR buffers
_gc_save_cleanout if TRUE, save cleanout to apply later
_gc_split_flush if TRUE, flush index split redo before rejecting bast
_gc_statistics if TRUE, kcl statistics are maintained
_gc_temp_affinity if TRUE, enable global temporary affinity
_gc_transfer_ratio dynamic object read-mostly transfer ratio
_gc_undo_affinity if TRUE, enable undo affinity
_gc_undo_block_disk_reads if TRUE, enable undo block disk reads
_gc_vector_read if TRUE, vector read current buffers
_gcr_cpu_min_free minimum amount of free CPU to flag an anomaly
_gcr_enable_high_cpu_kill if TRUE, GCR may kill foregrounds under high load
_gcr_enable_high_cpu_rm if TRUE, GCR may enable a RM plan under high load
_gcr_enable_high_cpu_rt if TRUE, GCR may boost bg priority under high load
_gcr_enable_high_memory_kill if TRUE, GCR may kill foregrounds under high memory load
_gcr_enable_new_drm_check if FALSE, revert to old drm load metric
_gcr_enable_statistical_cpu_check if FALSE, revert to old cpu load metric
_gcr_high_cpu_threshold minimum amount of CPU process must consume to be kill target
_gcr_high_memory_threshold minimum amount of Memory process must consume to be kill target
_gcr_max_rt_procs maximum number of RT DLM processes allowed by GCR
_gcr_mem_min_free minimum amount of free memory to flag an anomaly
_gcr_use_css if FALSE, GCR wont register with CSS nor use any CSS feature
_gcs_disable_remote_handles disable remote client/shadow handles
_gcs_disable_skip_close_remastering if TRUE, disable skip close optimization in remastering
_gcs_disable_switch_role_with_writer if TRUE, disable switching to local role with a writer
_gcs_fast_reconfig if TRUE, enable fast reconfiguration for gcs locks
_gcs_latches number of gcs resource hash latches to be allocated per LMS process
_gcs_min_slaves if non zero, it enables the minimum number of gcs slaves
_gcs_pkey_history number of pkey remastering history
_gcs_process_in_recovery if TRUE, process gcs requests during instance recovery
_gcs_res_hash_buckets number of gcs resource hash buckets to be allocated
_gcs_res_per_bucket number of gcs resource per hash bucket
_gcs_reserved_resources allocate the number of reserved resources in reconfiguration
_gcs_reserved_shadows allocate the number of reserved shadows in reconfiguration
_gcs_resources number of gcs resources to be allocated
_gcs_shadow_locks number of pcm shadow locks to be allocated
_gcs_testing GCS testing parameter
_generalized_pruning_enabled controls extensions to partition pruning for general predicates
_ges_dd_debug if 1 or higher enables GES deadlock detection debug diagnostics
_ges_default_lmds default lmds for enqueue hashing
_ges_designated_master designated master for GES and GCS resources
_ges_diagnostics if TRUE enables GES diagnostics
_ges_diagnostics_asm_dump_level systemstate level on global enqueue diagnostics blocked by ASM
_ges_direct_free if TRUE, free each resource directly to the freelist
_ges_direct_free_res_type string of resource types(s) to directly free to the freelist
_ges_dump_open_locks if TRUE, dump open locks for the LCK process during shutdown
_ges_fggl DLM fg grant lock on/off
_ges_freeable_res_chunk_free if TRUE, free dynamic resource chunks which are freeable
_ges_freeable_res_chunk_free_interval time interval for freeing freeable dynamic resource chunks
_ges_gather_res_reuse_stats if TRUE, gather resource reuse statistics
_ges_hash_groups enqueue hash table groups
_ges_health_check if greater than 0 enables GES system health check
_ges_lmd_mapping enqueue to lmd mapping
_ges_nres_divide how to divide number of enqueue resources among hash tables
_ges_num_blockers_to_kill number of blockers to be killed for hang resolution
_ges_resource_memory_opt enable different level of ges res memory optimization
_ges_server_processes number of background global enqueue server processes
_global_hang_analysis_interval_secs the interval at which global hang analysis is run
_globalindex_pnum_filter_enabled enables filter for global index with partition extended syntax
_grant_secure_role Disallow granting of SR to NSR
_groupby_nopushdown_cut_ratio groupby nopushdown cut ratio
_groupby_orderby_combine groupby/orderby don't combine threshold
_gs_anti_semi_join_allowed enable anti/semi join for the GS query
_gsm GSM descriptions
_gsm_config_vers version of gsm config
_gsm_cpu_thresh CPU busy threshold
_gsm_drv_interval metric derived values interval
_gsm_max_instances_per_db maximum number of instances per database in gsm cloud
_gsm_max_num_regions maximum number of regions in gsm cloud
_gsm_region_list List of GSM Regions
_gsm_srlat_thresh Single block read latency threshold
_gsm_thresh_respct threshold resource percentage
_gsm_thresh_zone threshold zone
_gwm_spare1 gsm spare 1
_gwm_spare2 gsm spare 2
_gwm_spare3 gsm spare 3
_hang_analysis_num_call_stacks hang analysis num call stacks
_hang_base_file_count Number of trace files for the normal base trace file
_hang_base_file_space_limit File space limit for current normal base trace file
_hang_bool_spare1 Hang Management 1
_hang_delay_resolution_for_libcache Hang Management delays hang resolution for library cache
_hang_detection_enabled Hang Management detection
_hang_detection_interval Hang Management detection interval in seconds
_hang_hang_analyze_output_hang_chains if TRUE hang manager outputs hang analysis hang chains
_hang_hiload_promoted_ignored_hang_count Hang Management high load or promoted ignored hang count
_hang_hiprior_session_attribute_list Hang Management high priority session attribute list
_hang_ignored_hang_count Hang Management ignored hang count
_hang_ignored_hangs_interval Time in seconds ignored hangs must persist after verification
_hang_int_spare2 Hang Management 2
_hang_log_verified_hangs_to_alert Hang Management log verified hangs to alert log
_hang_long_wait_time_threshold Long session wait time threshold in seconds
_hang_lws_file_count Number of trace files for long waiting sessions
_hang_lws_file_space_limit File space limit for current long waiting session trace file
_hang_monitor_archiving_related_hang_int Time in seconds ignored hangs must persist after verification
erval
_hang_msg_checksum_enabled enable hang graph message checksum
_hang_resolution_allow_archiving_issue_t Hang Management hang resolution allow archiving issue termination
ermination
_hang_resolution_confidence_promotion Hang Management hang resolution confidence promotion
_hang_resolution_global_hang_confidence_ Hang Management hang resolution global hang confidence promotion
promotion
_hang_resolution_policy Hang Management hang resolution policy
_hang_resolution_promote_process_termina Hang Management hang resolution promote process termination
tion
_hang_resolution_scope Hang Management hang resolution scope
_hang_signature_list_match_output_freque Hang Signature List matched output frequency
ncy
_hang_statistics_collection_interval Hang Management statistics collection interval in seconds
_hang_statistics_collection_ma_alpha Hang Management statistics collection moving average alpha
_hang_statistics_high_io_percentage_thre Hang Management statistics high IO percentage threshold
shold
_hang_terminate_session_replay_enabled Hang Management terminates sessions allowing replay
_hang_verification_interval Hang Management verification interval in seconds
_hard_protection if TRUE enable H.A.R.D specific format changes
_hash_join_enabled enable/disable hash join
_hash_multiblock_io_count number of blocks hash join will read/write at once
_hashops_prefetch_size maximum no of rows whose relevant memory locations are prefetched
_hb_redo_msg_interval BOC HB redo message interval in ms
_heatmap_format_1block heatmap related - to be used by oracle dev only
_heatmap_min_maxsize Internal testing only
_heur_deadlock_resolution_secs the heuristic wait time per node for deadlock resolution
_high_priority_processes High Priority Process Name Mask
_high_server_threshold high server thresholds
_highres_drift_allowed_sec allowed highres timer drift for VKTM
_highthreshold_undoretention high threshold undo_retention in seconds
_hj_bit_filter_threshold hash-join bit filtering threshold (0 always enabled)
_hm_analysis_oradebug_sys_dump_level the oradebug system state level for hang manager hang analysis
_hm_xm_enabled If TRUE, DIA0 allows message exchanges across DB/ASM boundary
_hwm_sync_threshold HWM synchronization threshold in percentage
_idl_conventional_index_maintenance enable conventional index maintenance for insert direct load
_idle_session_kill_enabled enables or disables resource manager session idle limit checks
_idxrb_rowincr proportionality constant for dop vs. rows in index rebuild
_ignore_desc_in_index ignore DESC in indexes, sort those columns ascending anyhow
_ignore_edition_enabled_for_EV_creation ignore schema's edition-enabled status during EV creation
_ignore_fg_deps ignore fine-grain dependencies during invalidation
_ilm_mem_limit percentage of the max shared pool heat-map can use - internal
_ilmflush_stat_limit ILM flush statistics limit - Internal testing only
_ilmset_stat_limit ILM set statistics limit - Internal testing only
_ilmstat_memlimit Percentage of shared pool for use by ILM Statistics
_image_redo_gen_delay Image redo generation delay in centi-seconds (direct write mode)
_immediate_commit_propagation if TRUE, propagate commit SCN immediately
_improved_outerjoin_card improved outer-join cardinality calculation
_improved_row_length_enabled enable the improvements for computing the average row length
_imr_active Activate Instance Membership Recovery feature
_imr_avoid_double_voting Avoid device voting for CSS reconfig during IMR
_imr_controlfile_access_wait_time IMR controlfile access wait time in seconds
_imr_device_type Type of device to be used by IMR
_imr_disk_voting_interval Maximum wait for IMR disk voting (seconds)
_imr_diskvote_implementation IMR disk voting implementation method
_imr_evicted_member_kill IMR issue evicted member kill after a wait
_imr_evicted_member_kill_wait IMR evicted member kill wait time in seconds
_imr_extra_reconfig_wait Extra reconfiguration wait in seconds
_imr_highload_threshold IMR system highload threshold
_imr_max_reconfig_delay Maximum Reconfiguration delay (seconds)
_imr_rr_holder_kill_time IMR max time instance is allowed to hold RR lock in seconds
_imr_splitbrain_res_wait Maximum wait for split-brain resolution (seconds)
_imr_systemload_check Perform the system load check during IMR
_imu_pools in memory undo pools
_in_memory_tbs_search FALSE - disable fast path for alter tablespace read only
_in_memory_undo Make in memory undo for top level transactions
_incremental_recovery_ckpt_min_batch minimum number of writes for incremental recovery ckpt every second
_index_join_enabled enable the use of index joins
_index_max_inc_trans_pct max itl expand percentage soft limit during index insert
_index_partition_large_extents Enables large extent allocation for partitioned indices
_index_prefetch_factor index prefetching factor
_index_scan_check_skip_corrupt check and skip corrupt blocks during index scans
_index_scan_check_stopkey check stopkey during index range scans
_init_granule_interval number of granules to process for deferred cache
_init_sql_file File containing SQL statements to execute upon database creation
_inject_startup_fault inject fault in the startup code
_inline_sql_in_plsql inline SQL in PL/SQL
_inplace_update_retry inplace update retry for ora1551
_inquiry_retry_interval if greater than 0 enables inquiry retry after specified interval
_insert_enable_hwm_brokered during parallel inserts high water marks are brokered
_inst_locking_period period an instance can retain a newly acquired level1 bitmap
_interconnect_checksum if TRUE, checksum interconnect blocks
_intrapart_pdml_enabled Enable intra-partition updates/deletes
_intrapart_pdml_randomlocal_enabled Enable intra-partition updates/deletes with random local dist
_io_internal_test I/O internal testing parameter
_io_osd_param OSD specific parameter
_io_outlier_threshold Latency threshold for io_outlier table
_io_resource_manager_always_on io resource manager always on
_io_shared_pool_size Size of I/O buffer pool from SGA
_io_slaves_disabled Do not use I/O slaves
_io_statistics if TRUE, ksfd I/O statistics are collected
_iocalibrate_init_ios iocalibrate init I/Os per process
_iocalibrate_max_ios iocalibrate max I/Os per process
_ioq_fanin_multiplier IOQ miss count before a miss exception
_ior_serialize_fault inject fault in the ior serialize code
_iorm_tout IORM scheduler timeout value in msec
_ioslave_batch_count Per attempt IOs picked
_ioslave_issue_count IOs issued before completion check
_ipc_fail_network Simulate cluster network failer
_ipc_test_failover Test transparent cluster network failover
_ipc_test_mult_nets simulate multiple cluster networks
_ipddb_enable Enable IPD/DB data collection
_job_queue_interval Wakeup interval in seconds for job queue co-ordinator
_k2q_latches number of k2q latches
_ka_allow_reenable reenability of kernel accelerator service after disable
_ka_compatibility_requirement kernel accelerator compatibility operation requirement
_ka_doorbell kernel accelerator doorbell mode
_ka_locks_per_sector locks per sector in kernel accelerator
_ka_mode kernel accelerator mode
_ka_msg_reap_count maximum number of KA messages to receive and process per wait
_ka_pbatch_messages kernel accelerator perform pbatch messages
_kcfis_automem_level Set auto memory management control for kcfis memory allocation
_kcfis_block_dump_level Smart IO block dump level
_kcfis_caching_enabled enable kcfis intra-scan session caching
_kcfis_cell_passthru_dataonly Allow dataonly passthru for smart scan
_kcfis_cell_passthru_enabled Do not perform smart IO filtering on the cell
_kcfis_cell_passthru_fromcpu_enabled Enable automatic passthru mode when cell CPU util is too high
_kcfis_celloflsrv_passthru_enabled Enable offload server usage for passthru operations
_kcfis_celloflsrv_usage_enabled Enable offload server usage for offload operations
_kcfis_control1 Kcfis control1
_kcfis_control2 Kcfis control2
_kcfis_control3 Kcfis control3
_kcfis_control4 Kcfis control4
_kcfis_control5 Kcfis control5
_kcfis_control6 Kcfis control6
_kcfis_disable_platform_decryption Don't use platform-specific decryption on the storage cell
_kcfis_dump_corrupt_block Dump any corrupt blocks found during smart IO
_kcfis_fast_response_enabled Enable smart scan optimization for fast response (first rows)
_kcfis_fast_response_initiosize Fast response - The size of the first IO in logical blocks
_kcfis_fast_response_iosizemult Fast response - (next IO size = current IO size * this parameter)
_kcfis_fast_response_threshold Fast response - the number of IOs after which smartIO is used
_kcfis_fault_control Fault Injection Control
_kcfis_io_prefetch_size Smart IO prefetch size for a cell
_kcfis_ioreqs_throttle_enabled Enable Smart IO requests throttling
_kcfis_kept_in_cellfc_enabled Enable usage of cellsrv flash cache for kept objects
_kcfis_large_payload_enabled enable large payload to be passed to cellsrv
_kcfis_max_cached_sessions Sets the maximum number of kcfis sessions cached
_kcfis_max_out_translations Sets the maximum number of outstanding translations in kcfis
_kcfis_nonkept_in_cellfc_enabled Enable use of cellsrv flash cache for non-kept objects
_kcfis_oss_io_size KCFIS OSS I/O size
_kcfis_qm_prioritize_sys_plan Prioritize Quaranitine Manager system plan
_kcfis_qm_user_plan_name Quaranitine Manager user plan name
_kcfis_rdbms_blockio_enabled Use block IO instead of smart IO in the smart IO module on RDBMS
_kcfis_read_buffer_limit KCFIS Read Buffer (per session) memory limit in bytes
_kcfis_spawn_debugger Decides whether to spawn the debugger at kcfis initialize
_kcfis_stats_level sets kcfis stats level
_kcfis_storageidx_diag_mode Debug mode for storage index on the cell
_kcfis_storageidx_disabled Don't use storage index optimization on the storage cell
_kcfis_test_control1 kcfis tst control1
_kcfis_trace_bucket_size KCFIS tracing bucket size in bytes
_kcl_commit if TRUE, call kjbcommit
_kcl_conservative_log_flush if TRUE, conservatively log flush before CR serving
_kcl_debug if TRUE, record le history
_kcl_index_split if TRUE, reject pings on blocks in middle of a split
_kd_symtab_chk enable or disable symbol table integrity block check
_kdbl_enable_post_allocation allocate dbas after populating data buffers
_kdi_avoid_block_checking avoid index block checking on sensitive opcodes
_kdic_segarr_sz size threshold for segmented arrays for seg_info_kdicctx
_kdis_reject_level b+tree level to enable rejection limit
_kdis_reject_limit #block rejections in space reclamation before segment extension
_kdis_reject_ops enable rejection heuristic for branch splits
_kdlf_read_flag kdlf read flag
_kdli_STOP_bsz undocumented parameter for internal use only
_kdli_STOP_dba undocumented parameter for internal use only
_kdli_STOP_fsz undocumented parameter for internal use only
_kdli_STOP_nio undocumented parameter for internal use only
_kdli_STOP_tsn undocumented parameter for internal use only
_kdli_allow_corrupt allow corrupt filesystem_logging data blocks during read/write
_kdli_buffer_inject use buffer injection for CACHE [NO]LOGGING lobs
_kdli_cache_inode cache inode state across calls
_kdli_cache_read_threshold minimum lob size for cache->nocache read (0 disables heuristic)
_kdli_cache_size maximum #entries in inode cache
_kdli_cache_verify verify cached inode via deserialization
_kdli_cache_write_threshold minimum lob size for cache->nocache write (0 disables heuristic)
_kdli_cacheable_length minimum lob length for inode cacheability
_kdli_checkpoint_flush do not invalidate cache buffers after write
_kdli_dbc override db_block_checking setting for securefiles
_kdli_delay_flushes delay flushing cache writes to direct-write lobs
_kdli_descn_adj coalesce extents with deallocation scn adjustment
_kdli_flush_cache_reads flush cache-reads data blocks after load
_kdli_flush_injections flush injected buffers of CACHE NOLOGGING lobs before commit
_kdli_force_cr force CR when reading data blocks of direct-write lobs
_kdli_force_cr_meta force CR when reading metadata blocks of direct-write lobs
_kdli_force_storage force storage settings for all lobs
_kdli_full_readahead_threshold maximum lob size for full readahead
_kdli_inject_assert inject asserts into the inode
_kdli_inject_batch buffer injection batch size [1, KCBNEWMAX]
_kdli_inject_crash inject crashes into the inode
_kdli_inline_xfm allow inline transformed lobs
_kdli_inode_preference inline inode evolution preference (data, headless, lhb)
_kdli_inplace_overwrite maximum inplace overwrite size (> chunksize)
_kdli_itree_entries #entries in lhb/itree blocks (for testing only)
_kdli_memory_protect trace accesses to inode memory outside kdli API functions
_kdli_mts_so use state objects in shared server for asyncIO pipelines
_kdli_oneblk allocate chunks as single blocks
_kdli_preallocation_mode preallocation mode for lob growth
_kdli_preallocation_pct percentage preallocation [0 .. inf) for lob growth
_kdli_ralc_length lob length threshold to trigger rounded allocations
_kdli_ralc_rounding rounding granularity for rounded allocations
_kdli_rci_lobmap_entries #entries in RCI lobmap before migration to lhb
_kdli_readahead_limit shared/cached IO readahead limit
_kdli_readahead_strategy shared/cached IO readahead strategy
_kdli_recent_scn use recent (not dependent) scns for block format/allocation
_kdli_reshape reshape an inode to inline or headless on length truncation
_kdli_safe_callbacks invoke inode read/write callbacks safely
_kdli_sio_async asynchronous shared IO
_kdli_sio_backoff use exponential backoff when attempting SIOP allocations
_kdli_sio_bps maximum blocks per IO slot
_kdli_sio_dop degree-of-parallelism in the SIO keep pool
_kdli_sio_fbwrite_pct percentage of buffer used for direct writes in flashback-db
_kdli_sio_fgio reap asynchronous IO in the foreground
_kdli_sio_fileopen shared IO fileopen mode: datasync vs nodatasync vs async
_kdli_sio_flush enable shared IO pool operations
_kdli_sio_free free IO buffers when not in active use
_kdli_sio_min_read shared IO pool read threshold
_kdli_sio_min_write shared IO pool write threshold
_kdli_sio_nbufs maximum #IO buffers to allocate per session
_kdli_sio_niods maximum #IO descriptors to allocate per session
_kdli_sio_on enable shared IO pool operations
_kdli_sio_pga use PGA allocations for direct IO
_kdli_sio_pga_top PGA allocations come from toplevel PGA heap
_kdli_sio_strategy shared IO strategy: block vs. extent
_kdli_sio_write_pct percentage of buffer used for direct writes
_kdli_small_cache_limit size limit of small inode cache
_kdli_sort_dbas sort dbas during chunkification
_kdli_space_cache_limit maximum size of the space cache in #blocks
_kdli_squeeze compact lobmap extents with contiguous dbas
_kdli_timer_dmp dump inode timers on session termination
_kdli_timer_trc trace inode timers to uts/tracefile
_kdli_trace inode trace level
_kdli_vll_direct use skip-navigation and direct-positioning in vll-domain
_kdlu_max_bucket_size UTS kdlu bucket size
_kdlu_max_bucket_size_mts UTS kdlu bucket size for mts
_kdlu_trace_layer UTS kdlu per-layer trace level
_kdlu_trace_system UTS system dump
_kdlw_enable_ksi_locking enable ksi locking for lobs
_kdlw_enable_write_gathering enable lob write gathering for sql txns
_kdlwp_flush_threshold WGC flush threshold in bytes
_kdlxp_cmp_subunit_size size of compression sub-unit in bytes
_kdlxp_dedup_flush_threshold deduplication flush threshold in bytes
_kdlxp_dedup_hash_algo secure hash algorithm for deduplication - only on SecureFiles
_kdlxp_dedup_inl_pctfree deduplication pct size increase by which inlining avoided
_kdlxp_dedup_prefix_threshold deduplication prefix hash threshold in bytes
_kdlxp_dedup_wapp_len deduplication length to allow write-append
_kdlxp_lobcmpadp enable adaptive compression - only on SecureFiles
_kdlxp_lobcmplevel Default securefile compression
_kdlxp_lobcmprciver Default securefile compression map version
_kdlxp_lobcompress enable lob compression - only on SecureFiles
_kdlxp_lobdeduplicate enable lob deduplication - only on SecureFiles
_kdlxp_lobdedupvalidate enable deduplicate validate - only on SecureFiles
_kdlxp_lobencrypt enable lob encryption - only on SecureFiles
_kdlxp_mincmp minimum comp ratio in pct - only on SecureFiles
_kdlxp_mincmplen minimum loblen to compress - only on SecureFiles
_kdlxp_minxfm_size minimum transformation size in bytes
_kdlxp_spare1 deduplication spare 1
_kdlxp_uncmp lob data uncompressed - only on SecureFiles
_kdlxp_xfmcache enable xfm cache - only on SecureFiles
_kdt_buffering control kdt buffering for conventional inserts
_kdtgsp_retries max number of retries in kdtgsp if space returns same block
_kdu_array_depth array update retry recursion depth limits
_kdz_hcc_flags Miscellaneous HCC flags
_kdz_hcc_track_upd_rids Enable rowid tracking during updates
_kdz_pred_nrows Number of rows to predicate at a time in kdzt
_kdz_proj_nrows Number of rows to project at a time in kdzt
_kebm_nstrikes kebm # strikes to auto suspend an action
_kebm_suspension_time kebm auto suspension time in seconds
_kecap_cache_size Workload Replay INTERNAL parameter used to set memory usage in Application Repl
ay
_keep_remote_column_size remote column size does not get modified
_kernel_message_network_driver kernel message network driver
_kes_parse_model SQL Tune/SPA KES Layer Parse Model control parameter
_kffmap_hash_size size of kffmap_hash table
_kffmlk_hash_size size of kffmlk_hash table
_kffmop_chunks number of chunks of kffmop's
_kffmop_hash_size size of kffmop_hash table
_kfm_disable_set_fence disable set fence calls and revert to default (process fence)
_kghdsidx_count max kghdsidx count
_kgl_bucket_count Library cache hash table bucket count (2^_kgl_bucket_count * 256)
_kgl_cap_hd_alo_stacks capture stacks for library cache handle allocation
_kgl_cluster_lock Library cache support for cluster lock
_kgl_cluster_lock_read_mostly Library cache support for cluster lock read mostly optimization
_kgl_cluster_pin Library cache support for cluster pins
_kgl_debug Library cache debugging
_kgl_fixed_extents fixed extent size for library cache memory allocations
_kgl_hash_collision Library cache name hash collision possible
_kgl_heap_size extent size for library cache heap 0
_kgl_hot_object_copies Number of copies for the hot object
_kgl_kqr_cap_so_stacks capture stacks for library and row cache state objects
_kgl_large_heap_warning_threshold maximum heap size before KGL writes warnings to the alert log
_kgl_latch_count number of library cache latches
_kgl_message_locks RAC message lock count
_kgl_min_cached_so_count Minimum cached SO count. If > 1 can help find SO corruptions
_kgl_time_to_wait_for_locks time to wait for locks and pins before timing out
_kglsim_maxmem_percent max percentage of shared pool size to be used for KGL advice
_kgsb_threshold_size threshold size for base allocator
_kgx_latches # of mutex latches if CAS is not supported.
_kill_controlfile_enqueue_blocker enable killing controlfile enqueue blocker on timeout
_kill_diagnostics_timeout timeout delay in seconds before killing enqueue blocker
_kill_enqueue_blocker if greater than 0 enables killing enqueue blocker
_kill_java_threads_on_eoc Kill Java threads and do sessionspace migration at end of call
_kill_session_dump Process dump on kill session immediate
_kjac_force_outcome_current_session if TRUE, enable to run force outcome on the current session
_kjdd_call_stack_dump_enabled Enables printing of short call stack with the WFG
_kjdd_wfg_dump_cntrl To control the way Wait-For_Graph is dumped
_kjltmaxgt record latch requests that takes longer than this many us
_kjltmaxht record latch reqeust that are held longer than this many us
_kjlton track DLM latch usage on/off
_kkfi_trace trace expression substitution
_kks_free_cursor_stat_pct percentage of cursor stats buckets to scan on each load, in 1/10th of a percent
_kokli_cache_size Size limit of ADT Table Lookup Cache
_kokln_current_read Make all LOB reads for this session 'current' reads
_kolfuseslf allow kolf to use slffopen
_kqdsn_max_instance_bits maximum bits used for instance value in sequence partition
_kqdsn_min_instance_bits minimum bits used for instance value in sequence partition
_kqdsn_partition_ratio ratio of instance to session bits in sequence partition
_kql_subheap_trace tracing level for library cache subheap level pins
_kqr_optimistic_reads optimistic reading of row cache objects
_ksb_restart_clean_time process uptime for restarts
_ksb_restart_policy_times process restart policy times in seconds
_ksd_test_param KSD test parmeter
_ksdx_charset_ratio ratio between the system and oradebug character set
_ksdxdocmd_default_timeout_ms default timeout for internal oradebug commands
_ksdxdocmd_enabled if TRUE ksdxdocmd* invocations are enabled
_ksdxw_cini_flg ksdxw context initialization flag
_ksdxw_nbufs ksdxw number of buffers in buffered mode
_ksdxw_num_pgw number of watchpoints on a per-process basis
_ksdxw_num_sgw number of watchpoints to be shared by all processes
_ksdxw_stack_depth number of PCs to collect in the stack when watchpoint is hit
_kse_die_timeout amount of time a dying process is spared by PMON (in centi-secs)
_kse_pc_table_size kse pc table cache size
_kse_signature_entries number of entries in the kse stack signature cache
_kse_signature_limit number of stack frames to cache per kse signature
_kse_snap_ring_record_stack should error snap ring entries show a short stack trace
_kse_snap_ring_size ring buffer to debug internal error 17090
_kse_trace_int_msg_clear enables soft assert of KGECLEAERERROR is cleares an interrupt message
_ksfd_verify_write verify asynchronous writes issued through ksfd
_ksi_clientlocks_enabled if TRUE, DLM-clients can provide the lock memory
_ksi_trace KSI trace string of lock type(s)
_ksi_trace_bucket memory tracing: use ksi-private or rdbms-shared bucket
_ksi_trace_bucket_size size of the KSI trace bucket
_ksipc_libipc_path over-ride default location of libipc
_ksipc_mode ksipc mode
_ksipc_spare_param1 ksipc spare param 1
_ksipc_spare_param2 ksipc spare param 2
_ksipc_wait_flags tune ksipcwait
_ksm_post_sga_init_notif_delay_secs seconds to delay instance startup at sga initialization (post)
_ksm_pre_sga_init_notif_delay_secs seconds to delay instance startup at sga initialization (pre)
_ksmb_debug ksmb debug flags
_ksmd_protect_mode KSMD protect mode for catching stale access
_ksmg_granule_locking_status granule locking status
_ksmg_granule_size granule size in bytes
_ksmg_lock_check_interval timeout action interval in minutes
_ksmg_lock_reacquire_count repeat count for acquisition of locks
_ksmlsaf KSM log alloc and free
_kspol_tac_timeout timeouts for TAC registerd by kspol
_ksr_unit_test_processes number of ksr unit test processes
_kss_callstack_type state object callstack trace type
_kss_quiet if TRUE access violations during kss dumps are not recorded
_ksu_diag_kill_time number of seconds ksuitm waits before killing diag
_ksuitm_addon_trccmd command to execute when dead processes don't go away
_ksuitm_dont_kill_dumper delay inst. termination to allow processes to dump
_ksv_dynamic_flags1 ksv dynamic flags 1 - override default behavior
_ksv_max_spawn_fail_limit bg slave spawn failure limit
_ksv_pool_hang_kill_to bg slave pool terminate timeout
_ksv_pool_wait_timeout bg slave pool wait limit
_ksv_slave_exit_timeout slave exit timeout
_ksv_spawn_control_all control all spawning of background slaves
_ksv_static_flags1 ksv static flags 1 - override default behavior
_ksvppktmode ksv internal pkt test
_ksxp_compat_flags ksxp compat flags
_ksxp_control_flags modify ksxp behavior
_ksxp_diagmode set to OFF to disable automatic slowsend diagnostics
_ksxp_disable_clss disable CLSS interconnects
_ksxp_disable_dynamic_loading disable dynamic loadin of lib skgxp
_ksxp_disable_ipc_stats disable ipc statistics
_ksxp_disable_rolling_migration disable possibility of starting rolling migration
_ksxp_dump_timeout set timeout for kjzddmp request
_ksxp_dynamic_skgxp_param dynamic skgxp parameters
_ksxp_if_config ksxp if config flags
_ksxp_init_stats_bkts initial number arrays for ipc statistics
_ksxp_lwipc_enabled enable lwipc for KSXP
_ksxp_max_stats_bkts max. arrays for ipc statistics
_ksxp_ping_enable disable dynamic loadin of lib skgxp
_ksxp_ping_polling_time max. arrays for ipc statistics
_ksxp_reaping tune ksxp layer reaping limit
_ksxp_reporting_process reporting process for KSXP
_ksxp_send_timeout set timeout for sends queued with the inter-instance IPC
_ksxp_skgxp_ant_options SKGXP ANT options
_ksxp_skgxp_compat_library_path over-ride default location of lib skgxp compat
_ksxp_skgxp_ctx_flags1 IPC debug options flags (RAC)
_ksxp_skgxp_ctx_flags1mask IPC debug options flags mask (RAC)
_ksxp_skgxp_dynamic_protocol IPC protocol override (RAC) (0/-1=*,2=UDP,3=RDS,!0x1000=ipc_X)
_ksxp_skgxp_inets limit SKGXP networks
_ksxp_skgxp_library_path over-ride default location of lib skgxp
_ksxp_skgxp_rgn_ports region socket limits (0xFFFFNNXX): F=flags, N=min, X=max
_ksxp_skgxp_spare_param1 ipc ksxp spare parameter 1
_ksxp_skgxp_spare_param2 ipc ksxp spare parameter 2
_ksxp_skgxp_spare_param3 ipc ksxp spare parameter 3
_ksxp_skgxp_spare_param4 ipc ksxp spare parameter 4
_ksxp_skgxp_spare_param5 ipc ksxp spare parameter 5
_ksxp_skgxpg_last_parameter last defined skgxpg parameter - ksxp
_ksxp_stats_mem_lmt limit ipc statistics memory. this parameter is a percentage value
_ksxp_testing KSXP test parameter
_ksxp_unit_test_byte_transformation enable byte transformation unit test
_ksxp_wait_flags tune ksxpwait
_ktb_debug_flags ktb-layer debug flags
_ktc_debug for ktc debug
_ktc_latches number of ktc latches
_ktilmsc_exp expiration time of ktilm segment cache (in second)
_ktslj_segext_max_mb segment pre-extension max size in MB (0: unlimited)
_ktslj_segext_retry segment pre-extension retry
_ktslj_segext_warning segment pre-extension warning threshold in percentage
_ktslj_segext_warning_mb segment pre-extension warning threshold in MB
_ktspsrch_maxsc maximum segments supported by space search cache
_ktspsrch_maxskip space search cache rejection skip upper limit
_ktspsrch_scchk cleanout check time of space search cache
_ktspsrch_scexp expiration time of space search cache
_ktst_rss_max maximum temp extents to be released across instance
_ktst_rss_min minimum temp extents to be released across instance
_ktst_rss_retry maximum retries of sort segment release
_kttext_warning tablespace pre-extension warning threshold in percentage
_ktu_latches number of KTU latches
_ku_trace datapump trace parameter
_kxdbio_ctx_init_count initial count of KXDBIO state object
_kxdbio_disable_offload_opcode KXDBIO Disable offload for the set opcodes. Value is a Bitmap of 0x00000001
- disable cell to cell data copy offload 0x00000002 - disable disk scrubbing
offload to cell
_kxdbio_enable_ds_opcode KXDBIO Enable Dumb storage simulation for the set opcodes.
_kxdbio_ut_ctl kxdbio unit test controls
_large_pool_min_alloc minimum allocation size in bytes for the large allocation pool
_last_allocation_period period over which an instance can retain an active level1 bitmap
_latch_class_0 latch class 0
_latch_class_1 latch class 1
_latch_class_2 latch class 2
_latch_class_3 latch class 3
_latch_class_4 latch class 4
_latch_class_5 latch class 5
_latch_class_6 latch class 6
_latch_class_7 latch class 7
_latch_classes latch classes override
_latch_miss_stat_sid Sid of process for which to collect latch stats
_latch_wait_list_pri_sleep_secs Time to sleep on latch wait list until getting priority
_ldr_io_size size of write IOs used during a load operation
_ldr_io_size2 size of write IOs used during a load operation of EHCC with HWMB
_ldr_pga_lim pga limit, beyond which new partition loads are delayed
_ldr_tempseg_threshold amount to buffer prior to allocating temp segment (extent sizing)
_left_nested_loops_random enable random distribution method for left of nestedloops
_lgwr_delay_write LGWR write delay for debugging
_lgwr_io_outlier LGWR I/O outlier frequency
_lgwr_io_slaves LGWR I/O slaves
_lgwr_max_ns_wt Maximum wait time for lgwr to allow NetServer to progress
_lgwr_ns_nl_max Variable to simulate network latency or buffer threshold
_lgwr_ns_nl_min Variable to simulate network latency or buffer threshold
_lgwr_ns_sim_err Variable to simulate errors lgwrns
_lgwr_posts_for_pending_bcasts LGWR posts commit waiters for pending broadcasts
_lgwr_ta_sim_err Variable to simulate errors lgwr true async
_library_cache_advice whether KGL advice should be turned on
_lightweight_hdrs Lightweight headers for redo
_like_with_bind_as_equality treat LIKE predicate with bind as an equality predicate
_limit_itls limit the number of ITLs in OLTP Compressed Tables
_linux_prepage_large_pages prepage large pages during allocation on Linux
_lm_activate_lms_threshold threshold value to activate an additional lms
_lm_asm_enq_hashing if TRUE makes ASM use enqueue master hashing for fusion locks
_lm_batch_compression_threshold GES threshold to start compression on batch messages
_lm_better_ddvictim GES better deadlock victim
_lm_big_cluster_optimizations enable certain big cluster optimizations in drm
_lm_broadcast_res Enable broadcast of highest held mode of resource.
_lm_broadcast_resname Trace string of resource type(s)
_lm_cache_allocated_res_ratio ratio of cached over allocated resources
_lm_cache_lvl0_cleanup how often to cleanup level 0 cache res (in sec)
_lm_cache_res_cleanup percentage of cached resources should be cleanup
_lm_cache_res_cleanup_tries max number of batches of cached resources to free per cleanup
_lm_cache_res_options ges resource cache options
_lm_cache_res_skip_cleanup multiple of iniital res cache below which cleanup is skipped
_lm_cache_res_type cache resource: string of lock types(s)
_lm_checksum_batch_msg GES checksum batch messages
_lm_comm_channel GES communication channel type
_lm_comm_msgq_busywait busy wait time in microsecond for msgq
_lm_comm_reap_count message reap count for receive
_lm_comm_tkts_add_factor Ticket allocation addition factor
_lm_comm_tkts_calc_period_length Weighted average calculation interval length (second)
_lm_comm_tkts_max_periods Max number of periods used in weighted avearage calculation
_lm_comm_tkts_min_decrease_wait Time to wait before allowing an allocation decrease
_lm_comm_tkts_min_increase_wait Time to wait before allowing an allocation increase
_lm_comm_tkts_mult_factor Ticket allocation multiplication factor
_lm_comm_tkts_nullreq_threshold Null request frequency threshold (percentage)
_lm_compression_scheme GES compression scheme
_lm_contiguous_res_count number of contiguous blocks that will hash to the same HV bucket
_lm_dd_ignore_nodd if TRUE nodeadlockwait/nodeadlockblock options are ignored
_lm_dd_interval dd time interval in seconds
_lm_dd_max_search_time max dd search time per token
_lm_dd_maxdump max number of locks to be dumped during dd validation
_lm_dd_scan_interval dd scan interval in seconds
_lm_dd_search_cnt number of dd search per token get
_lm_deferred_msg_timeout deferred message timeout
_lm_drm_batch_time time in seconds to wait to batch drm requests
_lm_drm_disable disable drm in different level
_lm_drm_hiload_percentage drm high load threshold percentage
_lm_drm_lowload_percentage drm low load threshold percentage
_lm_drm_max_requests dynamic remastering maximum affinity requests processed together
_lm_drm_min_interval minimum interval in secs between two consecutive drms
_lm_drm_object_scan enable/disable object scan to force full table scan always
_lm_drm_window dynamic remastering bucket window size
_lm_drm_xlatch dynamic remastering forced exclusive latches
_lm_drmopt12 enable drm scan optimizations in 12
_lm_drmopt12_nolatch enable drm latching optimizations in 12
_lm_dump_null_lock dump null lock in state dump
_lm_dynamic_lms dynamic lms invocation
_lm_dynamic_load dynamic load adjustment
_lm_enable_aff_benefit_stats enables affinity benefit computations if TRUE
_lm_enq_lock_freelist Number of ges enqueue element freelist
_lm_enq_rcfg if TRUE enables enqueue reconfiguration
_lm_enqueue_blocker_dump_timeout enqueue blocker dump timeout
_lm_enqueue_blocker_dump_timeout_cnt enqueue blocker dump timeout count
_lm_enqueue_blocker_kill_timeout enqueue blocker kill timeout
_lm_enqueue_freelist Number of enqueue freelist
_lm_enqueue_timeout enqueue suggested min timeout in seconds
_lm_fdrm_stats gather full drm statistics
_lm_file_affinity mapping between file id and master instance number
_lm_file_read_mostly mapping between read-mostly file id and master instance number
_lm_free_queue_threshold GES free queue threshold
_lm_freeze_kill_time timeout for killing unfrozen processes in rcfg/drm freeze step
_lm_global_posts if TRUE deliver global posts to remote nodes
_lm_hashtable_bkt_high High element threshold in hash table bucket
_lm_hashtable_bkt_low Low element threshold in hash table bucket
_lm_hashtable_bkt_thr Threshold for hash table resizing
_lm_hb_acceptable_hang_condition list of acceptable hang conditions in heartbeat check
_lm_hb_callstack_collect_time hb diagnostic call stack collection time in seconds
_lm_hb_disable_check_list list of process names to be disabled in heartbeat check
_lm_hb_enable_acl_check to enable the wait analysis with acceptable condition lists
_lm_hb_exponential_hang_time_factor heartbeat exponential hang time multiplier
_lm_hb_maximum_hang_report_count maximum heartbeat hang report count
_lm_high_load_sysload_percentage high watermark system load percentage
_lm_high_load_threshold high load threshold parameter
_lm_idle_connection_check GES idle connection check
_lm_idle_connection_check_interval GES idle connection check interval time
_lm_idle_connection_instance_check_callo GES idle connection instance check callout
ut
_lm_idle_connection_kill GES idle connection kill
_lm_idle_connection_kill_max_skips GES idle connection max skip kill request
_lm_idle_connection_max_ignore_kill_coun GES maximum idle connection kill request ignore count
t
_lm_idle_connection_quorum_threshold GES idle connection health quorum threshold
_lm_kill_fg_on_timeout GES kill fg on IPC timeout
_lm_lhupd_interval load and health update interval
_lm_lmd_waittime default wait time for lmd in centiseconds
_lm_lmon_nowait_latch if TRUE makes lmon get nowait latches with timeout loop
_lm_lms number of background gcs server processes to start
_lm_lms_opt_priority enable freeslot lms priority optimization
_lm_lms_priority_check_frequency frequency of LMS priority decisions in milliseconds
_lm_lms_priority_dynamic enable lms priority modification
_lm_lms_rt_threshold maximum number of real time lms processes on machine
_lm_lms_spin make lms not sleep
_lm_lms_waittime default wait time for lms in centiseconds
_lm_local_hp_enq use static file affinity for HP enqueue mastership
_lm_locks number of enqueues configured for cluster database
_lm_low_load_percentage low watermark percentage for load threshold
_lm_master_weight master resource weight for this instance
_lm_max_lms max. number of background global cache server processes
_lm_msg_batch_size GES batch message size
_lm_msg_cleanup_interval GES message buffer cleanup interval time
_lm_no_lh_check skip load and health check at decision points
_lm_no_sync skip reconfiguration/drm syncr/synca messaging
_lm_node_join_opt cluster database node join optimization in reconfig
_lm_non_fault_tolerant disable cluster database fault-tolerance mode
_lm_num_bnft_stats_buckets number of buckets in the benefit stats hash table
_lm_num_pt_buckets number of buckets in the object affinity hash table
_lm_num_pt_latches number of latches in the object affinity hash table
_lm_postevent_buffer_size postevent buffer size
_lm_preregister_css_restype enqueue type that requires pre-registration to css
_lm_proc_freeze_timeout reconfiguration: process freeze timeout
_lm_process_batching GES implicit process batching for IPC messages
_lm_process_lock_q_scan_limit limit on scanning process lock queue instead of resource convert lock queue
_lm_procs number of client processes configured for cluster database
_lm_psrcfg enable pseudo reconfiguration
_lm_rac_spare_dp1 rac parameter dp1
_lm_rac_spare_dp10 rac parameter dp10
_lm_rac_spare_dp2 rac parameter dp2
_lm_rac_spare_dp3 rac parameter dp3
_lm_rac_spare_dp4 rac parameter dp4
_lm_rac_spare_dp5 rac parameter dp5
_lm_rac_spare_dp6 rac parameter dp6
_lm_rac_spare_dp7 rac parameter dp7
_lm_rac_spare_dp8 rac parameter dp8
_lm_rac_spare_dp9 rac parameter dp9
_lm_rac_spare_p1 rac parameter p1
_lm_rac_spare_p10 rac parameter p10
_lm_rac_spare_p2 rac parameter p2
_lm_rac_spare_p3 rac parameter p3
_lm_rac_spare_p4 rac parameter p4
_lm_rac_spare_p5 rac parameter p5
_lm_rac_spare_p6 rac parameter p6
_lm_rac_spare_p7 rac parameter p7
_lm_rac_spare_p8 rac parameter p8
_lm_rac_spare_p9 rac parameter p9
_lm_rcfg_timeout dlm reconfiguration timeout
_lm_rcvinst designated instance to do instance recovery
_lm_rcvr_hang_allow_time receiver hang allow time in seconds
_lm_rcvr_hang_cfio_kill to kill receiver hang at control file IO
_lm_rcvr_hang_check_frequency receiver hang check frequency in seconds
_lm_rcvr_hang_check_system_load examine system load when check receiver health
_lm_rcvr_hang_kill to kill receiver hang
_lm_rcvr_hang_systemstate_dump_level systemstate dump level upon receiver hang
_lm_res_hash_bucket number of resource hash buckets
_lm_res_part number of resource partition configured for gcs
_lm_res_tm_hash_bucket number of extra TM resource hash buckets
_lm_resend_open_convert_timeout timeout in secs before resubmitting the open-convert
_lm_ress number of resources configured for cluster database
_lm_rm_slaves if non zero, it enables remastering slaves
_lm_send_mode GES send mode
_lm_send_queue_batching GES send queue message batching
_lm_send_queue_length GES send queue maximum length
_lm_sendproxy_reserve GES percentage of send proxy reserve of send tickets
_lm_share_lock_opt if TRUE enables share lock optimization
_lm_single_inst_affinity_lock enable single instance affinity lock optimization
_lm_spare_threads number of spare threads to be created by the GPnP master
_lm_spare_undo number of spare undo tablespaces to be created by GPnP master
_lm_sq_batch_factor GES send queue minimum batching factor
_lm_sq_batch_type GES send queue batching mechanism
_lm_sq_batch_waittick GES send queue batching waittime in tick
_lm_sync_timeout Synchronization timeout for DLM reconfiguration steps
_lm_ticket_active_sendback Flow control ticket active sendback threshold
_lm_tickets GES messaging tickets
_lm_tx_delta TX lock localization delta
_lm_use_gcr use GCR module if TRUE
_lm_use_new_defmsgtmo_action use new defered msg queue timeout action
_lm_use_tx_tsn use undo tsn affinity master as TX enqueue master
_lm_validate_pbatch GES process batch validation
_lm_wait_pending_send_queue GES wait on pending send queue
_lm_watchpoint_maximum GES number of watchpoints
_lm_watchpoint_timeout GES maximum time in seconds to keep watchpoint
_lm_xids number of transaction IDs configured for cluster database
_lmn_compression suppl logging for compression enabled
_load_without_compile Load PL/SQL or Database objects without compilation
_local_arc_assert_on_wait Assert whenever local ORL arch waits for space
_local_communication_costing_enabled enable local communication costing when TRUE
_local_communication_ratio set the ratio between global and local communication (0..100)
_local_hang_analysis_interval_secs the interval at which local hang analysis is run
_lock_ref_constraint_count number of nowait attempts to lock referential constraint
_lock_sga_areas Lock specified areas of the SGA in physical memory
_log_archive_avoid_memcpy log archive avoid memcpy
_log_archive_buffers Number of buffers to allocate for archiving
_log_archive_callout archival callout
_log_archive_network_redo_size Log archive network redo buffer size used by ARCH
_log_archive_prot_auto_demote log archive protection auto demotion
_log_archive_strong_auth log archive security strong auth
_log_archive_trace_pids log archive trace pids parameter
_log_blocks_during_backup log block images when changed during backup
_log_buffer_coalesce Coalescing log buffers for log writes
_log_buffers_corrupt corrupt redo buffers before write
_log_buffers_debug debug redo buffers (slows things down)
_log_checkpoint_recovery_check # redo blocks to verify after checkpoint
_log_committime_block_cleanout Log commit-time block cleanout
_log_deletion_policy archivelog deletion policy for mandatory/all destination
_log_event_queues number of the log writer event queues
_log_file_sync_timeout Log file sync timeout (centiseconds)
_log_max_optimize_threads maximum number of threads to which log scan optimization is applied
_log_parallelism_dynamic Enable dynamic strands
_log_parallelism_max Maximum number of log buffer strands
_log_private_mul Private strand multiplier for log space preallocation
_log_private_parallelism_mul Active sessions multiplier to deduce number of private strands
_log_read_buffer_size buffer size for reading log files
_log_read_buffers Number of log read buffers for media recovery
_log_simultaneous_copies number of simultaneous copies into redo buffer(# of copy latches)
_log_space_errors should we report space errors to alert log
_log_switch_timeout Maximum number of seconds redos in the current log could span
_log_undo_df_info generate marker to log file# that belong to undo tablespace
_log_write_info_size Size of log write info array
_log_writer_worker_dlm_hearbeat_update_f LGWR worker DLM health-monitoring heartbeat update frequency (ms)
req
_logout_storm_rate number of processes that can logout in a second
_logout_storm_retrycnt maximum retry count for logouts
_logout_storm_timeout timeout in centi-seconds for time to wait between retries
_long_bcast_ack_warning_threshold threshold for long bcast ack warning messages in ms
_long_log_write_warning_threshold threshold for long log write warning messages in ms
_longops_enabled longops stats enabled
_low_server_threshold low server thresholds
_lowres_drift_allowed_sec allowed lowres timer drift for VKTM
_ltc_trace tracing level for load table conventional
_lthread_cleanup_intv_secs interval for cleaning lightweight threads in secs
_lthread_clnup_hk_wait_secs timeout after hard killing operation for lthread to exit
_lthread_clnup_pmon_softkill_wait_secs wait timeout for PMON between soft kill and hard kill of lthreads
_lthread_clnup_spawner_sk_wait_secs timeout for spawner between soft kill and hard kill of lthreads
_lthread_debug Enable Debugging mode for lightweight threads
_lthread_enabled Enable lightweight threads
_lthread_max_spawn_time_csecs maximum time interval a spawner will wait for a lthread to get ready
_lthread_spawn_check_intv_ms time interval for a spawner to check for spawnee to get ready
_lthread_step_debugging Enable Step wise Debugging mode for lightweight threads
_main_dead_process_scan_interval PMON main dead process scan interval (in seconds)
_master_direct_sends direct sends for messages from master (DFS)
_mav_refresh_consistent_read refresh materialized views using consistent read snapshot
_mav_refresh_double_count_prevented materialized view MAV refreshes avoid double counting
_mav_refresh_opt optimizations during refresh of materialized views
_mav_refresh_unionall_tables # tables for union all expansion during materialized view refresh
_max_aq_persistent_queue_memory max aq persistent queue memory
_max_async_wait_for_catch_up Switchover wait time for async LNS to catch up in seconds
_max_clients_per_emon maximum number of clients per emon
_max_cr_rollbacks Maximum number of CR rollbacks per block (LMS)
_max_data_transfer_cache_size Maximum size of data transfer cache
_max_defer_gran_xfer_atonce Maximum deferred granules transferred by MMAN atonce
_max_exponential_sleep max sleep during exponential backoff
_max_filestat_tries maximum number of file stat tries
_max_fsu_segments Maximum segments to track for fast space usage
_max_fsu_stale_time Allowed space usage staleness in seconds
_max_incident_file_size Maximum size (in KB, MB, GB, Blocks) of incident dump file
_max_io_size Maximum I/O size in bytes for sequential file accesses
_max_kcnibr_ranges Max number of nonlogged data block ranges
_max_large_io IORM:max number of large I/O's to issue
_max_largepage_alloc_time_secs Maximum number of seconds to spend on largepage allocation
_max_lns_shutdown_archival_time Maximum time spent by LNS to archive last log during shutdown
_max_log_write_io_parallelism Maximum I/O parallelism within a log write (auto=0)
_max_log_write_parallelism Maximum parallelism within a log write (auto=0)
_max_outstanding_log_writes Maximum number of outstanding redo log writes
_max_pending_scn_bcasts maximum number of pending SCN broadcasts
_max_protocol_support Max occurrence protocols supported in a process
_max_queued_report_requests Maximum number of report requests that can be queued in a list
_max_reasonable_scn_rate Max reasonable SCN rate
_max_report_flushes_percycle Max no of report requests that can be flushed per cycle
_max_rwgs_groupings maximum no of groupings on materialized views
_max_services maximum number of database services
_max_shrink_obj_stats number of segments for which shrink stats will be maintained
_max_sleep_holding_latch max time to sleep while holding a latch
_max_small_io IORM:max number of small I/O's to issue
_max_spacebg_msgs_percentage maximum space management interrupt message throttling
_max_spacebg_slaves maximum space management background slaves
_max_spacebg_tasks maximum space management background tasks
_max_string_size_bypass controls error checking for the max_string_size parameter
_max_sys_next_extent Dictionary managed SYSTEM tablespace maximum next extent size in MB (allowed ran
ge [16-4095], 0 if unlimited)
_media_recovery_read_batch media recovery block read batch
_mem_annotation_pr_lev private memory annotation collection level
_mem_annotation_scale memory annotation pre-allocation scaling
_mem_annotation_sh_lev shared memory annotation collection level
_mem_annotation_store memory annotation in-memory store
_mem_std_extent_size standard extent size for fixed-size-extent heaps
_memory_broker_log_stat_entries memory broker num stat entries
_memory_broker_marginal_utility_bc Marginal Utility threshold pct for bc
_memory_broker_marginal_utility_sp Marginal Utility threshold pct for sp
_memory_broker_shrink_heaps memory broker allow policy to shrink shared pool
_memory_broker_shrink_java_heaps memory broker allow policy to shrink java pool
_memory_broker_shrink_streams_pool memory broker allow policy to shrink streams pool
_memory_broker_shrink_timeout memory broker policy to timeout shrink shared/java pool
_memory_broker_stat_interval memory broker statistics gathering interval for auto sga
_memory_checkinuse_timeintv check inuse time interval
_memory_imm_mode_without_autosga Allow immediate mode without sga/memory target
_memory_initial_sga_split_perc Initial default sga target percentage with memory target
_memory_management_tracing trace memory management activity
_memory_max_tgt_inc_cnt counts the times checker increments memory target
_memory_mgmt_fail_immreq always fail immediate mode request
_memory_mgmt_immreq_timeout time in seconds to time out immediate mode request
_memory_nocancel_defsgareq do not cancel deferred sga reqs with auto-memory
_memory_sanity_check partial granule sanity check
_messages message queue resources - dependent on # processes & # buffers
_mgd_rcv_handle_orphan_datafiles Managed recovery handle orphan datafile situation
_midtier_affinity_cluswait_prc_threshold cluster wait precentage threshold to enter affinity
_midtier_affinity_goodness_threshold goodness gradient threshold to dissolve affinity
_min_time_between_psp0_diag_secs minimum time between PSP0 diagnostic used for flow control
_minfree_plus max percentage of block space + minfree before we mark block full
_minimal_stats_aggregation prohibit stats aggregation at compile/partition maintenance time
_minimum_blocks_to_shrink minimum number freeable blocks for shrink to be present
_minimum_db_flashback_retention Minimum flashback retention
_minimum_extents_to_shrink minimum number freeable extents for shrink to be present
_mirror_redo_buffers Save buffers for debugging redo corruptions
_mmv_query_rewrite_enabled allow rewrites with multiple MVs and/or base tables
_modify_column_index_unusable allow ALTER TABLE MODIFY(column) to violate index key length limit
_module_action_old_length Use module and action old length parameter
_mpmt_enabled MPMT mode enabled
_mpmt_enabled_backgrounds mpmt enabled backgrounds
_mpmt_fg_enabled MPMT mode foreground enabled
_mpmt_procs_per_osp max procs per osp
_multi_instance_pmr force multi instance parallel recovery
_multi_join_key_table_lookup TRUE iff multi-join-key table lookup prefetch is enabled
_multi_transaction_optimization_enabled reduce SGA memory use during create of a partitioned table
_multiple_instance_recovery use multiple instances for media recovery
_mutex_spin_count Mutex spin count
_mutex_wait_scheme Mutex wait scheme
_mutex_wait_time Mutex wait time
_mv_add_log_placeholder add log placeholder
_mv_cleanup_orphaned_metadata cleanup orphaned materialized view metadata
_mv_complete_refresh_conventional use conventional INSERTs for MV complete refresh
_mv_deferred_no_log_age_val avoid build deferred MV log age validate
_mv_expression_extend_size MV expression extend size
_mv_generalized_oj_refresh_opt enable/disable new algorithm for MJV with generalized outer joins
_mv_refresh_ana what percent to analyze after complete/PCT refresh
_mv_refresh_costing refresh decision based on cost or on rules
_mv_refresh_delta_fraction delta mv as fractional percentage of size of mv
_mv_refresh_enhanced_dml_detection enable enhanced detection of DML types from MV log
_mv_refresh_eut refresh materialized views using EUT(partition)-based algorithm
_mv_refresh_force_parallel_query force materialized view refreshes to use parallel query
_mv_refresh_insert_no_append materialized view refresh using insert no append
_mv_refresh_new_setup_disabled materialized view MV refresh new setup disabling
_mv_refresh_no_idx_rebuild avoid index rebuild as part of the MV refresh
_mv_refresh_pkfk_data_units_opt control MV refresh based on the assumption of PK-FK data units
_mv_refresh_pkfk_relationship_opt control MV refresh based on the use of PK-FK relationships
_mv_refresh_rebuild_percentage minimum percentage change required in MV to force an indexrebuild
_mv_refresh_selections create materialized views with selections and fast refresh
_mv_refresh_update_analysis materialized view refresh using update analysis
_mv_refresh_use_hash_sj use hash_sj hint in queries
_mv_refresh_use_no_merge use no_merge hint in queries
_mv_refresh_use_stats pass cardinality hints to refresh queries
_mv_refsched_timeincr proportionality constant for dop vs. time in MV refresh
_mv_rolling_inv create/alter mv uses rolling cursor invalidation instead of immediate
_mwin_schedule Enable/disable Maintenance Window Schedules
_nameservice_consistency_check NameService Consistency check switch
_nchar_imp_cnv NLS allow Implicit Conversion between CHAR and NCHAR
_nchar_imp_conv should implicit conversion bewteen clob and nclob be allowed
_ncmb_readahead_enabled enable multi-block readahead for an index scan
_ncmb_readahead_tracing turn on multi-block readahead tracing
_ncomp_shared_objects_dir native compilation shared objects dir
_nested_loop_fudge nested loop fudge
_nested_mv_fast_oncommit_enabled nested MV refresh fast on commit allowed
_net_timeout_latency NET_TIMEOUT latency
_new_initial_join_orders enable initial join orders based on new ordering heuristics
_new_sort_cost_estimate enables the use of new cost estimate for sort
_newsort_enabled controls whether new sorts can be used as system sort
_newsort_ordered_pct controls when new sort avoids sorting ordered input
_newsort_type specifies options for the new sort algorithm
_nineteenth_spare_parameter nineteenth spare parameter - string
_ninth_spare_parameter ninth spare parameter - integer
_nlj_batching_ae_flag FAE flag type set after restoring to IO batching buffer
_nlj_batching_enabled enable batching of the RHS IO in NLJ
_nlj_batching_misses_enabled enable exceptions for buffer cache misses
_nls_parameter_sync_enabled enables or disables updates to v$parameter whenever an alter session statement m
odifies various nls parameters
_no_objects no object features are used
_no_or_expansion OR expansion during optimization disabled
_no_recovery_through_resetlogs no recovery through this resetlogs operation
_no_small_file Not to apply new extent scheme for small file temp spaces
_no_stale_joinback_rewrite No joinbacks if mv is stale
_nologging_kcnbuf_hash_buckets Number of nologging buffer hash buckets
_nologging_kcnbuf_hash_latches Number of nologging buffer hash latches
_nologging_load_slotsz Nologging standby: direct load buffer size
_nologging_sdcl_append_wait Nologging standby append sdcl wait time
_nologging_sendbuf_ratio Nologging standby: outstanding send buffer ratio
_nologging_txn_cmt_wait Nologging standby transaction commit wait time
_noncdb_to_pdb converting a non-cdb to a pdb
_noseg_for_unusable_index_enabled no segments for unusable indexes if set to TRUE
_notify_crs notify cluster ready services of startup and shutdown
_ns_max_flush_wt Flush wait time for NetServer to flush oustanding writes
_ns_max_send_delay Data Loss Time Bound for NetServer
_num_longop_child_latches number of child latches for long op array
_numa_buffer_cache_stats Configure NUMA buffer cache stats
_numa_shift_enabled Enable NUMA shift
_numa_shift_value user defined value for numa nodes shift
_numa_trace_level numa trace event
_number_cached_attributes maximum number of cached attributes per instance
_number_cached_group_memberships maximum number of cached group memberships
_obj_ckpt_tracing Enable object checkpoint tracing
_object_number_cache_size Object number cache size
_object_reuse_bast if 1 or higher, handle object reuse
_object_statistics enable the object level statistics collection
_object_stats_max_entries Maximum number of entries to be tracked per stat
_odci_aggregate_save_space trade speed for space in user-defined aggregation
_offline_rollback_segments offline undo segment list
_ogms_home GMS home directory
_olap_adv_comp_stats_cc_precomp do additional predicate stats analysis for AW rowsource
_olap_adv_comp_stats_max_rows do additional predicate stats analysis for AW rowsource
_olap_aggregate_buffer_size OLAP Aggregate max buffer size
_olap_aggregate_flags OLAP Aggregate debug flags
_olap_aggregate_function_cache_enabled OLAP Aggregate function cache enabler
_olap_aggregate_max_thread_tuples OLAP Aggregate max thread tuples creation
_olap_aggregate_min_buffer_size OLAP Aggregate min buffer size
_olap_aggregate_min_thread_status OLAP Aggregate minimum cardinality of dimensions for thread
_olap_aggregate_multipath_hier OLAP Aggregate Multi-path Hierarhies enabled
_olap_aggregate_statlen_thresh OLAP Aggregate status array usage threshold
_olap_aggregate_work_per_thread OLAP Aggregate max work parents
_olap_aggregate_worklist_max OLAP Aggregate max worklists generated at once
_olap_allocate_errorlog_format OLAP Allocate Errorlog Format
_olap_allocate_errorlog_header OLAP Allocate Errorlog Header format
_olap_analyze_max OLAP DML ANALYZE command max cells to analyze
_olap_continuous_trace_file OLAP logging definition
_olap_dbgoutfile_echo_to_eventlog OLAP DbgOutfile copy output to event log (tracefile)
_olap_dimension_corehash_force OLAP Dimension In-Core Hash Table Force
_olap_dimension_corehash_large OLAP Dimension In-Core Hash Table Large Threshold
_olap_dimension_corehash_pressure OLAP Dimension In-Core Hash Table Pressure Threshold
_olap_dimension_corehash_size OLAP Dimension In-Core Hash Table Maximum Memory Use
_olap_eif_export_lob_size OLAP EIF Export BLOB size
_olap_lmgen_dim_size Limitmap generator dimension column size
_olap_lmgen_meas_size Limitmap generator measure column size
_olap_object_hash_class OLAP Object Hash Table Class
_olap_page_pool_expand_rate OLAP Page Pool Expand Rate
_olap_page_pool_hi OLAP Page Pool High Watermark
_olap_page_pool_hit_target OLAP Page Pool Hit Target
_olap_page_pool_low OLAP Page Pool Low Watermark
_olap_page_pool_pressure OLAP Page Pool Pressure Threshold
_olap_page_pool_shrink_rate OLAP Page Pool Shrink Rate
_olap_parallel_update_server_num OLAP parallel update server count
_olap_parallel_update_small_threshold OLAP parallel update threshold for number of small pagespaces
_olap_parallel_update_threshold OLAP parallel update threshold in pages
_olap_row_load_time_precision OLAP Row Load Time Precision
_olap_sesscache_enabled OLAP Session Cache knob
_olap_sort_buffer_pct OLAP Sort Buffer Size Percentage
_olap_sort_buffer_size OLAP Sort Buffer Size
_olap_statbool_corebits OLAP Status Boolean max incore bits
_olap_statbool_threshold OLAP Status Boolean CBM threshold
_olap_table_function_statistics Specify TRUE to output OLAP table function timed statistics trace
_olap_wrap_errors Wrap error messages to OLAP outfile
_olapi_history_retention enable olapi history retention
_olapi_iface_object_history enable olapi interface object history collection
_olapi_iface_object_history_retention enable olapi interface object history retention
_olapi_iface_operation_history_retention enable olapi interface operation history retention
_olapi_interface_operation_history enable olapi interface operation history collection
_olapi_memory_operation_history enable olapi memory alloc/free history collection
_olapi_memory_operation_history_pause_at enable olapi memory alloc/free history collection pausing
_seqno
_olapi_memory_operation_history_retentio enable olapi memory operation history retention
n
_olapi_session_history enable olapi session history collection
_olapi_session_history_retention enable olapi session history retention
_old_connect_by_enabled enable/disable old connect by
_old_extent_scheme Revert to old extent allocation
_ols_cleanup_task Clean up unnecessary entries in OLS sessinfo table
_oltp_comp_dbg_scan oltp compression scan debug
_oltp_compression oltp compression enabled
_oltp_compression_gain oltp compression gain
_oltp_spill spill rows for oltp compression if loader pga limit is exceeded
_omf enable/disable OMF
_omni_enqueue_enable Enable Omni Enqueue feature (0 = disable, 1 = enable on ASM (default), 2 = enabl
e)
_oneside_colstat_for_equijoins sanity check on default selectivity for like/range predicate
_online_ctas_diag controls dumping diagnostic information for online ctas
_online_patch_disable_stack_check disable check for function on stack for online patches
_ops_per_semop the exact number of operations per semop system call
_optim_adjust_for_part_skews adjust stats for skews across partitions
_optim_dict_stats_at_db_cr_upg enable/disable dictionary stats gathering at db create/upgrade
_optim_enhance_nnull_detection TRUE to enable index [fast] full scan more often
_optim_new_default_join_sel improves the way default equijoin selectivity are computed
_optim_peek_user_binds enable peeking of user binds
_optimizer_adaptive_cursor_sharing optimizer adaptive cursor sharing
_optimizer_adaptive_plan_control internal controls for adaptive plans
_optimizer_adaptive_plans enable adaptive plans
_optimizer_adjust_for_nulls adjust selectivity for null values
_optimizer_ads_max_table_count maximum number of tables in a join under ADS
_optimizer_ads_time_limit maximum time limit (seconds) under ADS
_optimizer_ads_use_result_cache use result cache for ADS queries
_optimizer_ansi_join_lateral_enhance optimization of left/full ansi-joins and lateral views
_optimizer_ansi_rearchitecture re-architecture of ANSI left, right, and full outer joins
_optimizer_autostats_job enable/disable auto stats collection job
_optimizer_aw_join_push_enabled Enables AW Join Push optimization
_optimizer_aw_stats_enabled Enables statistcs on AW olap_table table function
_optimizer_batch_table_access_by_rowid enable table access by ROWID IO batching
_optimizer_better_inlist_costing enable improved costing of index access using in-list(s)
_optimizer_block_size standard block size used by optimizer
_optimizer_cache_stats cost with cache statistics
_optimizer_cartesian_enabled optimizer cartesian join enabled
_optimizer_cbqt_factor cost factor for cost-based query transformation
_optimizer_cbqt_no_size_restriction disable cost based transformation query size restriction
_optimizer_ceil_cost CEIL cost in CBO
_optimizer_coalesce_subqueries consider coalescing of subqueries optimization
_optimizer_complex_pred_selectivity enable selectivity estimation for builtin functions
_optimizer_compute_index_stats force index stats collection on index creation/rebuild
_optimizer_connect_by_cb_whr_only use cost-based transformation for whr clause in connect by
_optimizer_connect_by_combine_sw combine no filtering connect by and start with
_optimizer_connect_by_cost_based use cost-based transformation for connect by
_optimizer_connect_by_elim_dups allow connect by to eliminate duplicates from input
_optimizer_correct_sq_selectivity force correct computation of subquery selectivity
_optimizer_cost_based_transformation enables cost-based query transformation
_optimizer_cost_filter_pred enables costing of filter predicates in IO cost model
_optimizer_cost_hjsmj_multimatch add cost of generating result set when #rows per key > 1
_optimizer_cost_model optimizer cost model
_optimizer_cube_join_enabled enable cube join
_optimizer_degree force the optimizer to use the same degree of parallelism
_optimizer_dim_subq_join_sel use join selectivity in choosing star transformation dimensions
_optimizer_disable_strans_sanity_checks disable star transformation sanity checks
_optimizer_distinct_agg_transform Transforms Distinct Aggregates to non-distinct aggregates
_optimizer_distinct_elimination Eliminates redundant SELECT DISTNCT's
_optimizer_distinct_placement consider distinct placement optimization
_optimizer_dsdir_usage_control controls optimizer usage of dynamic sampling directives
_optimizer_dyn_smp_blks number of blocks for optimizer dynamic sampling
_optimizer_eliminate_filtering_join optimizer filtering join elimination enabled
_optimizer_enable_density_improvements use improved density computation for selectivity estimation
_optimizer_enable_extended_stats use extended statistics for selectivity estimation
_optimizer_enable_table_lookup_by_nl consider table lookup by nl transformation
_optimizer_enhanced_filter_push push filters before trying cost-based query transformation
_optimizer_extend_jppd_view_types join pred pushdown on group-by, distinct, semi-/anti-joined view
_optimizer_extended_cursor_sharing optimizer extended cursor sharing
_optimizer_extended_cursor_sharing_rel optimizer extended cursor sharing for relational operators
_optimizer_extended_stats_usage_control controls the optimizer usage of extended stats
_optimizer_false_filter_pred_pullup optimizer false predicate pull up transformation
_optimizer_fast_access_pred_analysis use fast algorithm to traverse predicates for physical optimizer
_optimizer_fast_pred_transitivity use fast algorithm to generate transitive predicates
_optimizer_feedback_control controls the optimizer feedback framework
_optimizer_filter_pred_pullup use cost-based flter predicate pull up transformation
_optimizer_filter_pushdown enable/disable filter predicate pushdown
_optimizer_fkr_index_cost_bias Optimizer index bias over FTS/IFFS under first K rows mode
_optimizer_force_CBQT force CBQT transformation regardless of cost
_optimizer_free_transformation_heap free transformation subheap after each transformation
_optimizer_full_outer_join_to_outer enable/disable full outer to left outer join conversion
_optimizer_gather_feedback optimizer gather feedback
_optimizer_gather_stats_on_load enable/disable online statistics gathering
_optimizer_generate_transitive_pred optimizer generate transitive predicates
_optimizer_group_by_placement consider group-by placement optimization
_optimizer_hybrid_fpwj_enabled enable hybrid full partition-wise join when TRUE
_optimizer_ignore_hints enables the embedded hints to be ignored
_optimizer_improve_selectivity improve table and partial overlap join selectivity computation
_optimizer_instance_count force the optimizer to use the specified number of instances
_optimizer_interleave_jppd interleave join predicate pushdown during CBQT
_optimizer_invalidation_period time window for invalidation of cursors of analyzed objects
_optimizer_join_elimination_enabled optimizer join elimination enabled
_optimizer_join_factorization use join factorization transformation
_optimizer_join_order_control controls the optimizer join order search algorithm
_optimizer_join_sel_sanity_check enable/disable sanity check for multi-column join selectivity
_optimizer_max_permutations optimizer maximum join permutations per query block
_optimizer_min_cache_blocks set minimum cached blocks
_optimizer_mjc_enabled enable merge join cartesian
_optimizer_mode_force force setting of optimizer mode for user recursive SQL also
_optimizer_multi_level_push_pred consider join-predicate pushdown that requires multi-level pushdown to base tabl
e
_optimizer_multi_table_outerjoin allows multiple tables on the left of outerjoin
_optimizer_multiple_cenv generate and run plans using several compilation environments
_optimizer_multiple_cenv_report control what to report in trace file when run in multi-plan mode
_optimizer_multiple_cenv_stmt control the types of statements that are run in multi-plan mode
_optimizer_native_full_outer_join execute full outer join using native implementaion
_optimizer_nested_rollup_for_gset number of groups above which we use nested rollup exec for gset
_optimizer_new_join_card_computation compute join cardinality using non-rounded input values
_optimizer_null_accepting_semijoin enables null-accepting semijoin
_optimizer_null_aware_antijoin null-aware antijoin parameter
_optimizer_or_expansion control or expansion approach used
_optimizer_or_expansion_subheap Use subheap for optimizer or-expansion
_optimizer_order_by_elimination_enabled Eliminates order bys from views before query transformation
_optimizer_outer_join_to_inner enable/disable outer to inner join conversion
_optimizer_outer_to_anti_enabled Enable transformation of outer-join to anti-join if possible
_optimizer_partial_join_eval partial join evaluation parameter
_optimizer_percent_parallel optimizer percent parallel
_optimizer_performance_feedback controls the performance feedback
_optimizer_proc_rate_level control the level of processing rates
_optimizer_proc_rate_source control the source of processing rates
_optimizer_purge_stats_iteration_row_cou number of rows to be deleted at each iteration of the stats pu
nt rging process
_optimizer_push_down_distinct push down distinct from query block to table
_optimizer_push_pred_cost_based use cost-based query transformation for push pred optimization
_optimizer_random_plan optimizer seed value for random plans
_optimizer_reuse_cost_annotations reuse cost annotations during cost-based query transformation
_optimizer_rownum_bind_default Default value to use for rownum bind
_optimizer_rownum_pred_based_fkr enable the use of first K rows due to rownum predicate
_optimizer_save_stats enable/disable saving old versions of optimizer stats
_optimizer_search_limit optimizer search limit
_optimizer_self_induced_cache_cost account for self-induced caching
_optimizer_skip_scan_enabled enable/disable index skip scan
_optimizer_skip_scan_guess consider index skip scan for predicates with guessed selectivity
_optimizer_sortmerge_join_enabled enable/disable sort-merge join method
_optimizer_sortmerge_join_inequality enable/disable sort-merge join using inequality predicates
_optimizer_squ_bottomup enables unnesting of subquery in a bottom-up manner
_optimizer_star_tran_in_with_clause enable/disable star transformation in with clause queries
_optimizer_star_trans_min_cost optimizer star transformation minimum cost
_optimizer_star_trans_min_ratio optimizer star transformation minimum ratio
_optimizer_starplan_enabled optimizer star plan enabled
_optimizer_strans_adaptive_pruning allow adaptive pruning of star transformation bitmap trees
_optimizer_system_stats_usage system statistics usage
_optimizer_table_expansion consider table expansion transformation
_optimizer_trace optimizer trace parameter
_optimizer_transitivity_retain retain equi-join pred upon transitive equality pred generation
_optimizer_try_st_before_jppd try Star Transformation before Join Predicate Push Down
_optimizer_undo_changes undo changes to query optimizer
_optimizer_undo_cost_change optimizer undo cost change
_optimizer_unnest_all_subqueries enables unnesting of every type of subquery
_optimizer_unnest_corr_set_subq Unnesting of correlated set subqueries (TRUE/FALSE)
_optimizer_unnest_disjunctive_subq Unnesting of disjunctive subqueries (TRUE/FALSE)
_optimizer_unnest_scalar_sq enables unnesting of of scalar subquery
_optimizer_use_cbqt_star_transformation use rewritten star transformation using cbqt framework
_optimizer_use_feedback optimizer use feedback
_optimizer_use_gtt_session_stats use GTT session private statistics
_optimizer_use_histograms enable/disable the usage of histograms by the optimizer
_optimizer_use_subheap Enables physical optimizer subheap
_or_expand_nvl_predicate enable OR expanded plan for NVL/DECODE predicate
_oracle_script Running an Oracle-supplied script
_oradbg_pathname path of oradbg script
_oradebug_cmds_at_startup oradebug commands to execute at instance startup
_oradebug_force force target processes to execute oradebug commands?
_ordered_nested_loop enable ordered nested loop costing
_ordered_semijoin enable ordered semi-join subquery
_orph_cln_interval qmon periodic interval for removed subscriber messages cleanup
_os_sched_high_priority OS high priority level
_oss_skgxp_udp_dynamic_credit_mgmt OSSLIB enable[!0]/disable[0] dynamic credit mgmt for SKGXP-UDP
_other_wait_event_exclusion exclude event names from _other_wait_threshold calculations
_other_wait_threshold threshold wait percentage for event wait class Other
_outline_bitmap_tree BITMAP_TREE hint enabled in outline
_parallel_adaptive_max_users maximum number of users running with default DOP
_parallel_blackbox_enabled parallel execution blackbox enabled
_parallel_blackbox_sga true if blackbox will be allocated in SGA, false if PGA
_parallel_blackbox_size parallel execution blackbox bucket size
_parallel_broadcast_enabled enable broadcasting of small inputs to hash and sort merge joins
_parallel_cluster_cache_pct max percentage of the global buffer cache to use for affinity
_parallel_cluster_cache_policy policy used for parallel execution on cluster(ADAPTIVE/CACHED)
_parallel_conservative_queuing conservative parallel statement queuing
_parallel_ctas_enabled enable/disable parallel CTAS operation
_parallel_default_max_instances default maximum number of instances for parallel query
_parallel_execution_message_align Alignment of PX buffers to OS page boundary
_parallel_fake_class_pct fake db-scheduler percent used for testing
_parallel_fault_tolerance_threshold total number of faults fault-tolerance will handle
_parallel_fixwrite_bucket Number of buckets for each round of fix write
_parallel_heartbeat_snapshot_interval interval of snapshot to track px msging between instances
_parallel_heartbeat_snapshot_max maximum number of historical snapshots archived
_parallel_load_bal_unit number of threads to allocate per instance
_parallel_load_balancing parallel execution load balanced slave allocation
_parallel_load_publish_threshold diffrence in percentage controlling px load propagation
_parallel_min_message_pool minimum size of shared pool memory to reserve for pq servers
_parallel_optimization_phase_for_local parallel optimization phase when all slaves are local
_parallel_queuing_max_waitingtime parallel statement queuing: max waiting time in queue
_parallel_recovery_stopat stop at -position- to step through SMON
_parallel_replay_msg_limit Number of messages for each round of parallel replay
_parallel_scalability Parallel scalability criterion for parallel execution
_parallel_server_idle_time idle time before parallel query server dies (in 1/100 sec)
_parallel_server_sleep_time sleep time between dequeue timeouts (in 1/100ths)
_parallel_slave_acquisition_wait time(in seconds) to wait before retrying slave acquisition
_parallel_statement_queuing parallel statement queuing enabled
_parallel_syspls_obey_force TRUE to obey force parallel query/dml/ddl under System PL/SQL
_parallel_time_unit unit of work used to derive the degree of parallelism (in seconds)
_parallel_txn_global enable parallel_txn hint with updates and deletes
_parallelism_cost_fudge_factor set the parallelism cost fudge factor
_parameter_table_block_size parameter table block size
_part_access_version_by_number use version numbers to access versioned objects for partitioning
_part_redef_global_index_update online partition redefinition update global indexes
_partial_pwise_join_enabled enable partial partition-wise join when TRUE
_partition_advisor_srs_active enables sampling based partitioning validation
_partition_large_extents Enables large extent allocation for partitioned tables
_partition_view_enabled enable/disable partitioned views
_passwordfile_enqueue_timeout password file enqueue timeout in seconds
_pct_refresh_double_count_prevented materialized view PCT refreshes avoid double counting
_pdb_use_sequence_cache Use sequence cache in PDB mode
_pdml_gim_sampling control separation of global index maintenance for PDML
_pdml_gim_staggered slaves start on different index when doing index maint
_pdml_slaves_diff_part slaves start on different partition when doing index maint
_percent_flashback_buf_partial_full Percent of flashback buffer filled to be considered partial full
_pga_large_extent_size PGA large extent size
_pga_limit_check_wait_time microseconds to wait for over limit confirmation
_pga_limit_dump_summary dump PGA summary when signalling ORA-4036
_pga_limit_interrupt_smaller whether to interrupt smaller eligible processes
_pga_limit_min_req_size bytes of PGA usage below which process will not get ORA-4036
_pga_limit_simulated_physmem_size bytes of physical memory to determine pga_aggregate_limit with
_pga_limit_target_perc default percent of pga_aggregate_target for pga_aggregate_limit
_pga_limit_time_to_interrupt seconds to wait until direct interrupt
_pga_limit_time_until_idle seconds to wait before treating process as idle
_pga_limit_time_until_killed seconds to wait before killing session over limit
_pga_limit_tracing trace pga_aggregate_limit activity
_pga_limit_use_immediate_kill use immediate kill for sessions over limit
_pga_limit_watch_perc percentage of limit to have processes watch
_pga_limit_watch_size bytes of PGA usage at which process will begin watching limit
_pga_max_size Maximum size of the PGA memory for one process
_pgactx_cap_stacks capture stacks for setting pgactx
_pin_time_statistics if TRUE collect statistics for how long a current pin is held
_ping_wait_for_log_force Wait for log force before block ping
_pivot_implementation_method pivot implementation method
_pkt_enable enable progressive kill test
_pkt_pmon_interval PMON process clean-up interval (cs)
_pkt_start start progressive kill test instrumention
_plan_outline_data explain plan outline data enabled
_plan_verify_improvement_margin Performance improvement criterion for evolving plan baselines
_plan_verify_local_time_limit Local time limit to use for an individual plan verification
_plsql_anon_block_code_type PL/SQL anonymous block code-type
_plsql_cache_enable PL/SQL Function Cache Enabled
_plsql_dump_buffer_events conditions upon which the PL/SQL circular buffer is dumped
_plsql_max_stack_size PL/SQL maximum stack size
_plsql_minimum_cache_hit_percent plsql minimum cache hit percentage required to keep caching active
_plsql_native_frame_threshold Allocate PL/SQL native frames on the heap if size exceeds this value
_plsql_nvl_optimize PL/SQL NVL optimize
_pluggable_database_debug Debug flag for pluggable database related operations
_pmon_dead_blkrs_alive_chk_rate_secs rate to check blockers are alive during cleanup (in seconds)
_pmon_dead_blkrs_max_blkrs max blockers to check during cleanup
_pmon_dead_blkrs_max_cleanup_attempts max attempts per blocker while checking dead blockers
_pmon_dead_blkrs_scan_rate_secs rate to scan for dead blockers during cleanup (in seconds)
_pmon_enable_dead_blkrs look for dead blockers during PMON cleanup
_pmon_load_constants server load balancing constants (S,P,D,I,L,C,M)
_pmon_max_consec_posts PMON max consecutive posts in main loop
_post_wait_queues_dynamic_queues Post Wait Queues - Num Dynamic Queues
_post_wait_queues_num_per_class Post Wait Queues - Num Per Class
_pqq_debug_txn_act pq queuing transaction active
_pqq_enabled Enable Resource Manager based Parallel Statement Queuing
_pre_rewrite_push_pred push predicates into views before rewrite
_precompute_gid_values precompute gid values and copy them before returning a row
_pred_move_around enables predicate move-around
_predicate_elimination_enabled allow predicate elimination if set to TRUE
_prefered_standby standby db_unique_name prefered for krb operations
_prescomm presume commit of IMU transactions
_print_inmem_heatmap print inmem ilm heatmap
_print_refresh_schedule enable dbms_output of materialized view refresh schedule
_print_stat_segment print ilm statistics segment
_private_memory_address Start address of large extent memory segment
_project_view_columns enable projecting out unreferenced columns of a view
_projection_pushdown projection pushdown
_projection_pushdown_debug level for projection pushdown debugging
_prop_old_enabled Shift to pre 11g propagation behaviour
_protect_frame_heaps Protect cursor frame heaps
_ptn_cache_threshold flags and threshold to control partition metadata caching
_push_join_predicate enable pushing join predicate inside a view
_push_join_union_view enable pushing join predicate inside a union all view
_push_join_union_view2 enable pushing join predicate inside a union view
_px_adaptive_dist_method determines the behavior of adaptive distribution methods
_px_adaptive_dist_method_threshold Buffering / decision threshold for adaptive distribution methods
_px_adaptive_offload_percentage percentage for PQ adaptive offloading of granules
_px_adaptive_offload_threshold threshold (GB/s) for PQ adaptive offloading of granules
_px_async_getgranule asynchronous get granule in the slave
_px_back_to_parallel allow going back to parallel after a serial operation
_px_bind_peek_sharing enables sharing of px cursors that were built using bind peeking
_px_broadcast_fudge_factor set the tq broadcasting fudge factor percentage
_px_buffer_ttl ttl for px mesg buffers in seconds
_px_cdb_view_enabled parallel cdb view evaluation enabled
_px_chunklist_count_ratio ratio of the number of chunk lists to the default DOP per instance
_px_compilation_debug debug level for parallel compilation
_px_compilation_trace tracing level for parallel compilation
_px_concurrent enables pq with concurrent execution of serial inputs
_px_cpu_autodop_enabled enables or disables auto dop cpu computation
_px_cpu_operator_bandwidth CPU operator bandwidth in MB/sec for DOP computation
_px_cpu_process_bandwidth CPU process bandwidth in MB/sec for DOP computation
_px_dp_array_size Max number of pq processes supported
_px_dump_12805_source enables or disables tracing of 12805 signal source
_px_dynamic_opt turn off/on restartable qerpx dynamic optimization
_px_dynamic_sample_size num of samples for restartable qerpx dynamic optimization
_px_execution_services_enabled enable service-based constraint of px slave allocation
_px_filter_parallelized enables or disables correlated filter parallelization
_px_filter_skew_handling enable correlated filter parallelization to handle skew
_px_freelist_latch_divisor Divide the computed number of freelists by this power of 2
_px_gim_factor weighted autodop global index maintenance factor
_px_granule_batch_size maximum size of a batch of granules
_px_granule_randomize enables or disables randomization of parallel scans rowid granules
_px_granule_size default size of a rowid range granule (in KB)
_px_groupby_pushdown perform group-by pushdown for parallel query
_px_hold_time hold px at execution time (unit: second)
_px_hybrid_TSM_HWMB_load Enable Hybrid Temp Segment Merge/High Water Mark Brokered load method
_px_index_sampling_objsize parallel query sampling for index create based on object size
_px_io_process_bandwidth IO process bandwidth in MB/sec for computing DOP
_px_io_system_bandwidth total IO system bandwidth in MB/sec for computing DOP
_px_join_skew_handling enables skew handling for parallel joins
_px_join_skew_minfreq sets minimum frequency(%) for skewed value for parallel joins
_px_join_skew_ratio sets skew ratio for parallel joins
_px_kxib_tracing turn on kxib tracing
_px_load_balancing_policy parallel load balancing policy
_px_load_factor weighted autodop load factor
_px_load_monitor_threshold threshold for pushing information to load slave workload monitor
_px_load_publish_interval interval at which LMON will check whether to publish PX load
_px_loc_msg_cost CPU cost to send a PX message via shared memory
_px_max_granules_per_slave maximum number of rowid range granules to generate per slave
_px_max_map_val Maximum value of rehash mapping for PX
_px_max_message_pool_pct percentage of shared pool for px msg buffers range [5,90]
_px_message_compression enable compression of control messages for parallel query
_px_min_granules_per_slave minimum number of rowid range granules to generate per slave
_px_minus_intersect enables pq for minus/interect operators
_px_monitor_load enable consumer load slave workload monitoring
_px_net_msg_cost CPU cost to send a PX message over the internconnect
_px_no_granule_sort prevent parallel partition granules to be sorted on size
_px_no_stealing prevent parallel granule stealing in shared nothing environment
_px_nss_planb enables or disables NSS Plan B reparse with outline
_px_numa_stealing_enabled enable/disable PQ granule stealing across NUMA nodes
_px_numa_support_enabled enable/disable PQ NUMA support
_px_object_sampling parallel query sampling for base objects (100000 = 100%)
_px_object_sampling_enabled use base object sampling when possible for range distribution
_px_onepass_slave_acquisition enable/disable one pass slave acquisition for parallel execution
_px_parallelize_expression enables or disables expression evaluation parallelization
_px_partial_rollup_pushdown perform partial rollup pushdown for parallel execution
_px_partition_scan_enabled enables or disables parallel partition-based scan
_px_partition_scan_threshold least number of partitions per slave to start partition-based scan
_px_proactive_slave_alloc_threshold parallel proactive slave allocation threshold/unit
_px_proc_constrain reduce parallel_max_servers if greater than (processes - fudge)
_px_pwg_enabled parallel partition wise group by enabled
_px_pwmr_enabled parallel partition wise match recognize enabled
_px_replication_enabled enables or disables replication of small table scans
_px_round_robin_rowcnt round robin row count to enq to next slave
_px_rownum_pd turn off/on parallel rownum pushdown optimization
_px_send_timeout IPC message send timeout value in seconds
_px_single_server_enabled allow single-slave dfo in parallel query
_px_slaves_share_cursors slaves share cursors with QC
_px_tq_rowhvs turn on intra-row hash valueing sharing in TQ
_px_trace px trace parameter
_px_ual_serial_input enables new pq for UNION operators
_px_wif_dfo_declumping NDV-aware DFO clumping of multiple window sorts
_px_wif_extend_distribution_keys extend TQ data redistribution keys for window functions
_px_wif_min_ndv_per_slave mininum NDV of TQ keys needed per slave for scalable WiF PX
_px_xtgranule_size default size of a external table granule (in KB)
_qa_control Oracle internal parameter to control QA
_qa_lrg_type Oracle internal parameter to specify QA lrg type
_query_cost_rewrite perform the cost based rewrite with materialized views
_query_execution_cache_max_size max size of query execution cache
_query_mmvrewrite_maxcmaps query mmv rewrite maximum number of cmaps per dmap in query disjunct
_query_mmvrewrite_maxdmaps query mmv rewrite maximum number of dmaps per query disjunct
_query_mmvrewrite_maxinlists query mmv rewrite maximum number of in-lists per disjunct
_query_mmvrewrite_maxintervals query mmv rewrite maximum number of intervals per disjunct
_query_mmvrewrite_maxpreds query mmv rewrite maximum number of predicates per disjunct
_query_mmvrewrite_maxqryinlistvals query mmv rewrite maximum number of query in-list values
_query_mmvrewrite_maxregperm query mmv rewrite maximum number of region permutations
_query_on_physical query on physical
_query_rewrite_1 perform query rewrite before&after or only before view merging
_query_rewrite_2 perform query rewrite before&after or only after view merging
_query_rewrite_drj mv rewrite and drop redundant joins
_query_rewrite_expression rewrite with cannonical form for expressions
_query_rewrite_fpc mv rewrite fresh partition containment
_query_rewrite_fudge cost based query rewrite with MVs fudge factor
_query_rewrite_jgmigrate mv rewrite with jg migration
_query_rewrite_maxdisjunct query rewrite max disjuncts
_query_rewrite_or_error allow query rewrite, if referenced tables are not dataless
_query_rewrite_setopgrw_enable perform general rewrite using set operator summaries
_query_rewrite_vop_cleanup prune frocol chain before rewrite after view-merging
_queue_buffer_max_dump_len max number of bytes to dump to trace file for queue buffer dump
_radm_enabled Data Redaction
_rbr_ckpt_tracing Enable reuse block range checkpoint tracing
_rcfg_disable_verify if TRUE disables verify at reconfiguration
_rcfg_parallel_fixwrite if TRUE enables parallel fixwrite at reconfiguration
_rcfg_parallel_replay if TRUE enables parallel replay and cleanup at reconfiguration
_rcfg_parallel_verify if TRUE enables parallel verify at reconfiguration
_rdbms_compatibility default RDBMS compatibility level
_rdbms_internal_fplib_enabled enable CELL FPLIB filtering within rdbms
_rdbms_internal_fplib_raise_errors enable reraising of any exceptions in CELL FPLIB
_re_fast_sql_operator enables fast boxable sql operator
_re_independent_expression_cache_size defines max number of compiled cached expressions for iee
_re_num_complex_operator defines max number of compiled complex operator per ruleset-iee
_re_num_rowcache_load defines max number of complex operators loaded with row cache
_re_result_cache_keysiz defines max number key for result cache hash table
_re_result_cache_size defines max number of cached elements for result cache
_read_mostly_enable_logon Read mostly instances enable non-privileged logons
_read_mostly_instance indicates this is a read_mostly instance
_read_mostly_instance_qa_control internal parameter to control read mostly instance QA
_read_mostly_slave_timeout Time to wait on read mostly node when hub not available
_read_only_violation_dump_to_trace read-only violation dump to trace files
_read_only_violation_max_count read-only violation array max count
_read_only_violation_max_count_per_modul read-only violation array per module max count
e
_readable_standby_sync_timeout readable standby query scn sync timeout
_real_time_apply_sim Simulation value with real time apply
_realfree_heap_max_size minimum max total heap size, in Kbytes
_realfree_heap_mode mode flags for real-free heap
_realfree_heap_pagesize hint for real-free page size in bytes
_realfree_pq_heap_pagesize hint for pq real-free page size in bytes
_recoverable_recovery_batch_percent Recoverable recovery batch size (percentage of buffer cache)
_recovery_asserts if TRUE, enable expensive integrity checks
_recovery_percentage recovery buffer cache percentage
_recovery_read_limit number of recovery reads which can be outstanding
_recovery_skip_cfseq_check allow media recovery even if controlfile seq check fails
_recovery_verify_writes enable thread recovery write verify
_recursive_imu_transactions recursive transactions may be IMU
_recursive_with_max_recursion_level check for maximum level of recursion instead of checking for cycles
_redef_on_statement Use on-statement refresh in online redefinition
_redo_compatibility_check general and redo/undo compatibility sanity check
_redo_log_debug_config Various configuration flags for debugging redo logs
_redo_log_record_life Life time in hours for redo log table records
_redo_read_from_memory Enable reading redo from in-memory log buffer
_redo_transport_compress_all Is ASYNC LNS compression allowed?
_redo_transport_sanity_check redo transport sanity check bit mask
_redo_transport_stall_time I/O stall time before terminating redo transport process
_redo_transport_stall_time_long long I/O stall time before terminating redo transport process
_redo_transport_stream_test test stream connection?
_redo_transport_stream_writes Stream network writes?
_redo_transport_vio_size_req VIO size requirement
_reduce_sby_log_scan enable standby log scan optimization
_region_name gsm region name
_release_insert_threshold maximum number of unusable blocks to unlink from freelist
_reliable_block_sends if TRUE, no side channel on reliable interconnect
_relocate_pdb Relocate PDB to another RAC instance after it is closed in the current instance
_relocation_commit_batch_size ASM relocation commit batch size
_remote_asm remote ASM configuration
_remote_awr_enabled Enable/disable Remote AWR Mode
_remove_aggr_subquery enables removal of subsumed aggregated subquery
_remove_exf_component enable/disable removing of components EXF and RUL during upgrade
_rep_base_path base path for EM reports in database
_replace_virtual_columns replace expressions with virtual columns
_report_capture_cycle_time Time (in sec) between two cycles of report capture daemon
_report_capture_dbtime_percent_cutoff 100X Percent of system db time daemon is allowed over 10 cycles
_report_capture_recharge_window No of report capture cycles after which db time is recharged
_report_capture_timeband_length Length of time band (in hours) in the reports time bands table
_report_request_ageout_minutes Time (in min) after which a report request is deleted from queue
_reset_maxcap_history reset maxcap history time
_resource_includes_unlimited_tablespace Whether RESOURCE role includes UNLIMITED TABLESPACE privilege
_resource_manager_always_off disable the resource manager always
_resource_manager_plan resource mgr top plan for internal use
_restore_maxopenfiles restore assumption for maxopenfiles
_restore_spfile restore spfile to this location
_result_cache_auto_dml_monitoring_durati result cache auto dml monitoring duration
on
_result_cache_auto_dml_monitoring_slots result cache auto dml monitoring slot
_result_cache_auto_dml_threshold result cache auto dml threshold
_result_cache_auto_dml_trend_threshold result cache auto dml trend threshold
_result_cache_auto_execution_threshold result cache auto execution threshold
_result_cache_auto_size_threshold result cache auto max size allowed
_result_cache_auto_time_distance result cache auto time distance
_result_cache_auto_time_threshold result cache auto time threshold
_result_cache_block_size result cache block size
_result_cache_copy_block_count blocks to copy instead of pinning the result
_result_cache_deterministic_plsql result cache deterministic PLSQL functions
_result_cache_global Are results available globally across RAC?
_result_cache_timeout maximum time (sec) a session waits for a result
_resumable_critical_alert raise critical alert for resumable failure
_reuse_index_loop number of blocks being examine for index block reuse
_right_outer_hash_enable Right Outer/Semi/Anti Hash Enabled
_rm_cluster_interconnects interconnects for RAC use (RM)
_rm_numa_sched_enable Is Resource Manager (RM) related NUMA scheduled policy enabled
_rm_numa_simulation_cpus number of cpus for each pg for numa simulation in resource manager
_rm_numa_simulation_pgs number of PGs for numa simulation in resource manager
_rman_io_priority priority at which rman backup i/o's are done
_rman_roundrobin_placement Numa round robin placement for RMAN procs
_rollback_segment_count number of undo segments
_rollback_segment_initial starting undo segment number
_rollback_stopat stop at -position to step rollback
_rond_test_mode rac one node test mode
_row_cache_cursors number of cached cursors for row cache management
_row_cr enable row cr for all sql
_row_locking row-locking
_row_shipping_explain enable row shipping explain plan support
_row_shipping_threshold row shipping column selection threshold
_rowlen_for_chaining_threshold maximum rowlen above which rows may be chained across blocks
_rowsets_enabled enable/disable rowsets
_rowsets_max_rows maximum number of rows in a rowset
_rowsets_target_maxsize target size in bytes for space reserved in the frame for a rowset
_rowsource_execution_statistics if TRUE, Oracle will collect rowsource statistics
_rowsource_profiling_statistics if TRUE, Oracle will capture active row sources in v$active_session_history
_rowsource_statistics_sampfreq frequency of rowsource statistic sampling (must be a power of 2)
_rowsrc_trace_level Row source tree tracing level
_rta_sync_wait_timeout RTA sync wait timeout
_rtaddm_trigger_args comma-separated list of numeric arguments for RT addm trigger
_rtaddm_trigger_enabled To enable or disable Real-Time ADDM automatic trigger
_rtc_infeasible_threshold Redo Transport Compression infeasible threshold
_sample_rows_per_block number of rows per block used for sampling IO optimization
_scalar_type_lob_storage_threshold threshold for VARCHAR2, NVARCHAR2, and RAW storage as BLOB
_scatter_gcs_resources if TRUE, gcs resources are scattered uniformly across sub pools
_scatter_gcs_shadows if TRUE, gcs shadows are scattered uniformly across sub pools
_sched_delay_max_samples scheduling delay maximum number of samples
_sched_delay_measurement_sleep_us scheduling delay mesurement sleep us
_sched_delay_os_tick_granularity_us os tick granularity used by scheduling delay calculations
_sched_delay_sample_collection_thresh_ms scheduling delay sample collection duration threshold ms
_sched_delay_sample_interval_ms scheduling delay sampling interval in ms
_scn_wait_interface_max_backoff_time_sec max exponential backoff time for scn wait interface in kta
s
_scn_wait_interface_max_timeout_secs max timeout for scn wait interface in kta
_sdiag_crash sql diag crash
_sec_enable_test_rpcs Whether to enable the test RPCs
_second_spare_parameter second spare parameter - integer
_securefile_log_num_latches Maximum number of open descriptors for securefile log
_securefile_log_shared_pool_size Size of securefile log buffer pool from SGA
_securefile_timers collect kdlu timers and accumulate per layers
_securefiles_breakreten_retry segment retry before dishonoring retention
_securefiles_bulkinsert securefiles segment insert only optization
_securefiles_concurrency_estimate securefiles concurrency estimate
_securefiles_fg_retry segment retry before foreground waits
_securefiles_forceflush securefiles force flush before allocation
_securefiles_memory_percentofSGA securefiles memory as percent of SGA
_securefiles_spcutl securefiles segment utl optimization
_select_any_dictionary_security_enabled Exclude USER$, XS$VERIFIERS, ENC$ and DEFAULT_PWD$ from SELECT ANY D
ICTIONARY system privilege
_selectivity_for_srf_enabled enable/disable selectivity for storage reduction factor
_selfjoin_mv_duplicates control rewrite self-join algorithm
_selftune_checkpoint_write_pct Percentage of total physical i/os for self-tune ckpt
_selftune_checkpointing_lag Self-tune checkpointing lag the tail of the redo log
_sem_per_semid the exact number of semaphores per semaphore set to allocate
_send_ast_to_foreground if TRUE, send ast message to foreground
_send_close_with_block if TRUE, send close with block even with direct sends
_send_requests_to_pi if TRUE, try to send CR requests to PI buffers
_serial_direct_read enable direct read in serial
_serial_log_write_worker_io Serialize log write slave I/O
_serial_recovery force serial recovery or parallel recovery
_serializable serializable
_serialize_lgwr_sync_io Serialize LGWR SYNC local and remote io
_service_cleanup_timeout timeout to peform service cleanup
_session_allocation_latches one latch per group of sessions
_session_cached_instantiations Number of pl/sql instantiations to cache in a session.
_session_context_size session app context size
_session_idle_bit_latches one latch per session or a latch per group of sessions
_session_page_extent Session Page Extent Size
_session_wait_history enable session wait history collection
_set_mgd_recovery_state set mgd recovery state to new value
_seventeenth_spare_parameter seventeenth spare parameter - string
_seventh_spare_parameter seventh spare parameter - integer
_sf_default_enabled enable 12g securefile default
_sga_alloc_slaves_term_timeout_secs Termination timeout in secs for SA** slaves
_sga_clear_dump Allow dumping encrypted blocks in clear for debugging
_sga_early_trace sga early trace event
_sga_locking sga granule locking state
_shared_io_pool_buf_size Shared IO pool buffer size
_shared_io_pool_debug_trc trace kcbi debug info to tracefile
_shared_io_pool_size Size of shared IO pool
_shared_io_set_value shared io pool size set internal value - overwrite zero user size
_shared_iop_max_size maximum shared io pool size
_shared_pool_max_size shared pool maximum size when auto SGA enabled
_shared_pool_minsize_on shared pool minimum size when auto SGA enabled
_shared_pool_reserved_min_alloc minimum allocation size in bytes for reserved area of shared pool
_shared_pool_reserved_pct percentage memory of the shared pool allocated for the reserved area
_shared_server_load_balance shared server load balance
_shared_server_num_queues number of shared server common queues
_shmprotect allow mprotect use for shared memory
_short_stack_timeout_ms short stack timeout in ms
_show_mgd_recovery_state Show internal managed recovery state
_shrd_que_tm_processes number of sharded queue Time Managers to start
_shrd_que_tm_statistics_duration Shaded queue statistics collection window duration
_shrunk_aggs_disable_threshold percentage of exceptions at which to switch to full length aggs
_shrunk_aggs_enabled enable use of variable sized buffers for non-distinct aggregates
_shutdown_completion_timeout_mins minutes for shutdown operation to wait for sessions to complete
_side_channel_batch_size number of messages to batch in a side channel message (DFS)
_side_channel_batch_timeout timeout before shipping out the batched side channelmessages in seconds
_side_channel_batch_timeout_ms timeout before shipping out the batched side channelmessages in milliseconds
_simple_view_merging control simple view merging performed by the optimizer
_simulate_disk_sectorsize Enables skgfr to report simulated disk sector size
_simulate_io_wait Simulate I/O wait to test segment advisor
_simulate_mem_transfer simulate auto memory sga/pga transfers
_simulated_log_write_usecs Simulated latency of log writes (usecs)
_simulator_bucket_mindelta LRU bucket minimum delta
_simulator_internal_bound simulator internal bound percent
_simulator_lru_rebalance_sizthr LRU list rebalance threshold (size)
_simulator_lru_rebalance_thresh LRU list rebalance threshold (count)
_simulator_lru_scan_count LRU scan count
_simulator_pin_inval_maxcnt maximum count of invalid chunks on pin list
_simulator_reserved_heap_count simulator reserved heap count
_simulator_reserved_obj_count simulator reserved object count
_simulator_sampling_factor sampling factor for the simulator
_simulator_upper_bound_multiple upper bound multiple of pool size
_single_process run without detached processes
_siop_flashback_scandepth Shared IO pool flashback io completion scan depth
_siop_perc_of_bc_x100 percentange * 100 of cache to transfer to shared io pool
_sixteenth_spare_parameter sixteenth spare parameter - string
_sixth_spare_parameter sixth spare parameter - integer
_skgxp_ant_options SKGXP ANT options (oss)
_skgxp_ctx_flags1 IPC debug options flags (oss)
_skgxp_ctx_flags1mask IPC debug options flags mask (oss)
_skgxp_dynamic_protocol IPC protocol override (!0/-1=*,2=UDP,3=RDS,0x1000=ipc_X)
_skgxp_gen_ant_off_rpc_timeout_in_sec VRPC request timeout when ANT disabled
_skgxp_gen_ant_ping_misscount ANT protocol ping miss count
_skgxp_gen_rpc_no_path_check_in_sec ANT ping protocol miss count
_skgxp_gen_rpc_timeout_in_sec VRPC request timeout when ANT enabled
_skgxp_inets limit SKGXP networks (oss)
_skgxp_min_rpc_rcv_zcpy_len IPC threshold for rpc rcv zcpy operation (default = 0 - disabled)
_skgxp_min_zcpy_len IPC threshold for zcpy operation (default = 0 - disabled)
_skgxp_reaping tune skgxp OSD reaping limit
_skgxp_rgn_ports region socket limits (0xFFFFNNXX): F=flags, N=min, X=max
_skgxp_spare_param1 ipc oss spare parameter 1
_skgxp_spare_param2 ipc oss spare parameter 2
_skgxp_spare_param3 ipc oss spare parameter 3
_skgxp_spare_param4 ipc oss spare parameter 4
_skgxp_spare_param5 ipc oss spare parameter 5
_skgxp_udp_ach_reaping_time time in minutes before idle ach's are reaped
_skgxp_udp_ack_delay Enables delayed acks
_skgxp_udp_enable_dynamic_credit_mgmt Enables dynamic credit management
_skgxp_udp_hiwat_warn ach hiwat mark warning interval
_skgxp_udp_interface_detection_time_secs time in seconds between interface detection checks
_skgxp_udp_keep_alive_ping_timer_secs connection idle time in seconds before keep alive is initiated. min: 30 sec max:
1800 sec default: 300 sec
_skgxp_udp_lmp_mtusize MTU size for UDP LMP testing
_skgxp_udp_lmp_on enable UDP long message protection
_skgxp_udp_timed_wait_buffering diagnostic log buffering space (in bytes) for timed wait (0 means unbufferd
_skgxp_udp_timed_wait_seconds time in seconds before timed wait is invoked
_skgxp_udp_use_tcb disable use of high speek timer
_skgxp_zcpy_flags IPC zcpy options flags
_skgxpg_last_parameter last defined skgxpg parameter - oss
_skip_acfs_checks Override checking if on an ACFS file system
_skip_assume_msg if TRUE, skip assume message for consigns at the master
_skip_trstamp_check Skip terminal recovery stamp check
_slave_mapping_enabled enable slave mapping when TRUE
_slave_mapping_group_size force the number of slave group in a slave mapper
_slave_mapping_skew_ratio maximum skew before slave mapping is disabled
_small_table_threshold lower threshold level of table size for direct reads
_smm_advice_enabled if TRUE, enable v$pga_advice
_smm_advice_log_size overwrites default size of the PGA advice workarea history log
_smm_auto_cost_enabled if TRUE, use the AUTO size policy cost functions
_smm_auto_max_io_size Maximum IO size (in KB) used by sort/hash-join in auto mode
_smm_auto_min_io_size Minimum IO size (in KB) used by sort/hash-join in auto mode
_smm_bound overwrites memory manager automatically computed bound
_smm_control provides controls on the memory manager
_smm_freeable_retain value in KB of the instance freeable PGA memory to retain
_smm_isort_cap maximum work area for insertion sort(v1)
_smm_max_size maximum work area size in auto mode (serial)
_smm_max_size_static static maximum work area size in auto mode (serial)
_smm_min_size minimum work area size in auto mode
_smm_px_max_size maximum work area size in auto mode (global)
_smm_px_max_size_static static maximum work area size in auto mode (global)
_smm_retain_size work area retain size in SGA for shared server sessions (0 for AUTO)
_smm_trace Turn on/off tracing for SQL memory manager
_smon_internal_errlimit limit of SMON internal errors
_smon_undo_seg_rescan_limit limit of SMON continous undo segments re-scan
_smu_debug_mode <debug-flag> - set debug event for testing SMU operations
_smu_error_simulation_site site ID of error simulation in KTU code
_smu_error_simulation_type error type for error simulation in KTU code
_smu_timeouts comma-separated *AND double-quoted* list of AUM timeouts: mql, tur, sess_exprn,
qry_exprn, slot_intvl
_snapshot_recovery_enabled enable/disable snapshot recovery
_sort_elimination_cost_ratio cost ratio for sort eimination under first_rows mode
_sort_multiblock_read_count multi-block read count for sort
_sort_spill_threshold force sort to spill to disk each time this many rows are received
_sort_sync_min_spill_threshold controls the mininum spill size for synchronized spill (in percent)
_sort_sync_min_spillsize controls the size of mininum run size for synchronized spill (in kb)
_space_align_size space align size
_spare_test_parameter Spare test parameter
_spawn_diag_opts thread spawn diagnostic options
_spawn_diag_thresh_secs thread spawn diagnostic minimal threshold in seconds
_spin_count Amount to spin waiting for a latch
_spr_max_rules maximum number of rules in sql spreadsheet
_spr_push_pred_refspr push predicates through reference spreadsheet
_spr_use_AW_AS enable AW for hash table in spreadsheet
_spr_use_hash_table use hash table for spreadsheet
_sql_analyze_enable_auto_txn SQL Analyze Autonomous Transaction control parameter
_sql_analyze_parse_model SQL Analyze Parse Model control parameter
_sql_compatibility sql compatability bit vector
_sql_connect_capability_override SQL Connect Capability Table Override
_sql_connect_capability_table SQL Connect Capability Table (testing only)
_sql_diag_repo_origin duarations where sql diag repository are retained
_sql_diag_repo_retain retain sql diag repository to cursor or not
_sql_hash_debug Hash value of the SQL statement to debug
_sql_hvshare_debug control hash value sharing debug level
_sql_hvshare_threshold threshold to control hash value sharing across operators
_sql_model_unfold_forloops specifies compile-time unfolding of sql model forloops
_sql_ncg_mode Optimization mode for SQL NCG
_sql_plan_directive_mgmt_control controls internal SQL Plan Directive management activities
_sql_plan_management_control controls various internal SQL Plan Management algorithms
_sql_show_expreval show expression evalution as shared hash producer in plan
_sqlexec_progression_cost sql execution progression monitoring cost threshold
_sqlmon_binds_xml_format format of column binds_xml in [G]V$SQL_MONITOR
_sqlmon_max_plan Maximum number of plans entry that can be monitored. Defaults to 20 per CPU
_sqlmon_max_planlines Number of plan lines beyond which a plan cannot be monitored
_sqlmon_recycle_time Minimum time (in s) to wait before a plan entry can be recycled
_sqlmon_threshold CPU/IO time threshold before a statement is monitored. 0 is disabled
_sqltune_category_parsed Parsed category qualifier for applying hintsets
_srvntfn_job_deq_timeout srvntfn job deq timeout
_srvntfn_jobsubmit_interval srvntfn job submit interval
_srvntfn_max_concurrent_jobs srvntfn max concurrent jobs
_srvntfn_q_msgcount srvntfn q msg count for job exit
_srvntfn_q_msgcount_inc srvntfn q msg count increase for job submit
_sscr_dir Session State Capture and Restore DIRectory object
_sscr_osdir Session State Capture and Restore OS DIRectory
_sta_control SQL Tuning Advisory control parameter
_stack_guard_level stack guard level
_standby_causal_heartbeat_timeout readable standby causal heartbeat timeout
_standby_flush_mode standby flush mode
_standby_implicit_rcv_timeout minutes to wait for redo during standby implicit recovery
_standby_switchover_timeout Number of secords for standby switchover enqueue timeout
_stat_aggs_one_pass_algorithm enable one pass algorithm for variance-related functions
_static_backgrounds static backgrounds
_statistics_based_srf_enabled enable/disable the use of statistics for storage reduction factor
_step_down_limit_in_pct step down limit in percentage
_streams_pool_max_size streams pool maximum size when auto SGA enabled
_subquery_pruning_cost_factor subquery pruning cost factor
_subquery_pruning_enabled enable the use of subquery predicates to perform pruning
_subquery_pruning_mv_enabled enable the use of subquery predicates with MVs to perform pruning
_subquery_pruning_reduction subquery pruning reduction factor
_suppress_identifiers_on_dupkey supress owner index name err msg
_switch_current_scan_scn switch current uses scan scn
_switchover_timeout Switchover timeout in minutes
_switchover_to_standby_option option for graceful switchover to standby
_switchover_to_standby_switch_log Switchover to standby switches log for open redo threads
_swrf_metric_frequent_mode Enable/disable SWRF Metric Frequent Mode Collection
_swrf_mmon_dbfus Enable/disable SWRF MMON DB Feature Usage
_swrf_mmon_flush Enable/disable SWRF MMON FLushing
_swrf_mmon_metrics Enable/disable SWRF MMON Metrics Collection
_swrf_on_disk_enabled Parameter to enable/disable SWRF
_swrf_test_action test action parameter for SWRF
_swrf_test_dbfus Enable/disable DB Feature Usage Testing
_sync_primary_wait_time wait time for alter session sync with primary
_synonym_repoint_tracing whether to trace metadata comparisons for synonym repointing
_sys_logon_delay failed logon delay for sys
_sysaux_test_param test parameter for SYSAUX
_system_api_interception_debug enable debug tracing for system api interception
_system_index_caching optimizer percent system index caching
_system_trig_enabled are system triggers enabled
_ta_lns_wait_for_arch_log LNS Wait time for arhcived version of online log
_table_lookup_prefetch_size table lookup prefetch vector size
_table_lookup_prefetch_thresh table lookup prefetch threshold
_table_scan_cost_plus_one bump estimated full table scan and index ffs cost by one
_tablespaces_per_transaction estimated number of tablespaces manipulated by each transaction
_target_log_write_size Do log write if this many redo blocks in buffer (auto=0)
_target_log_write_size_timeout How long LGWR will wait for redo to accumulate (csecs)
_target_rba_max_lag_percentage target rba max log lag percentage
_tdb_debug_mode set debug mode for testing transportable database
_temp_tran_block_threshold number of blocks for a dimension before we temp transform
_temp_tran_cache determines if temp table is created with cache option
_temp_undo_disable_adg is temp undo disabled on ADG
_tenth_spare_parameter tenth spare parameter - integer
_test_hm_extent_map heatmap related - to be used by oracle dev only
_test_ksusigskip test the function ksusigskip
_test_param_1 test parmeter 1 - integer
_test_param_2 test parameter 2 - string
_test_param_3 test parameter 3 - string
_test_param_4 test parameter 4 - string list
_test_param_5 test parmeter 5 - deprecated integer
_test_param_6 test parmeter 6 - size (ub8)
_test_param_7 test parameter 7 - big integer list
_test_param_8 test parameter 8 - cdb tests
_third_spare_parameter third spare parameter - integer
_thirteenth_spare_parameter thirteenth spare parameter - integer
_thread_state_change_timeout_pnp Thread state change timeout for PnP instance (in sec)
_threshold_alerts_enable if 1, issue threshold-based alerts
_time_based_rcv_ckpt_target time-based incremental recovery checkpoint target in sec
_time_based_rcv_hdr_update_interval time-based incremental recovery file header update interval in sec
_timemodel_collection enable timemodel collection
_timeout_actions_enabled enables or disables KSU timeout actions
_timer_precision VKTM timer precision in milli-sec
_total_large_extent_memory Total memory for allocating large extents
_tq_dump_period time period for duping of TQ statistics (s)
_trace_buffer_wait_timeouts trace buffer busy wait timeouts
_trace_buffers trace buffer sizes per process
_trace_dump_all_procs if TRUE on error buckets of all processes will be dumped to the current trace fi
le
_trace_dump_client_buckets if TRUE dump client (ie. non-kst) buckets
_trace_dump_cur_proc_only if TRUE on error just dump our process bucket
_trace_dump_static_only if TRUE filter trace dumps to always loaded dlls
_trace_events trace events enabled at startup
_trace_files_public Create publicly accessible trace files
_trace_kqlidp trace kqlidp0 operation
_trace_ktfs Trace ILM Stats Tracking
_trace_ktfs_mem Debug memleak
_trace_navigation_scope enabling trace navigation linking
_trace_pin_time trace how long a current pin is held
_trace_pool_size trace pool size in bytes
_trace_processes enable KST tracing in process
_trace_temp Trace Tempspace Management
_trace_virtual_columns trace virtual columns exprs
_track_metrics_memory Enable/disable Metrics Memory Tracking
_transaction_auditing transaction auditing records generated in the redo log
_transaction_recovery_servers max number of parallel recovery slaves that may be used
_transient_logical_clear_hold_mrp_bit clear KCCDI2HMRP flag during standby recovery
_truncate_optimization_enabled do truncate optimization if set to TRUE
_tsenc_obfuscate_key Encryption key obfuscation in memory
_tsenc_tracing Enable TS encryption tracing
_tsm_connect_string TSM test connect string
_tsm_disable_auto_cleanup Disable TSM auto cleanup actions
_tstz_localtime_bypass Should TTC not convert to LocalTime to preserve Timestamp with Timezone values
_tts_allow_charset_mismatch allow plugging in a tablespace with an incompatible character set
_twelfth_spare_parameter twelfth spare parameter - integer
_twentieth_spare_parameter twentieth spare parameter - string
_twenty-eighth_spare_parameter twenty-eighth spare parameter - boolean
_twenty-fifth_spare_parameter twenty-fifth spare parameter - string list
_twenty-first_spare_parameter twenty-first spare parameter - string list
_twenty-fourth_spare_parameter twenty-fourth spare parameter - string list
_twenty-second_spare_parameter twenty-second spare parameter - string list
_twenty-seventh_spare_parameter twenty-seventh spare parameter - boolean
_twenty-sixth_spare_parameter twenty-sixth spare parameter - boolean
_twenty-third_spare_parameter twenty-third spare parameter - string list
_two_pass enable two-pass thread recovery
_two_pass_reverse_polish_enabled uses two-pass reverse polish alg. to generate canonical forms
_txn_control_trace_buf_size size the in-memory buffer size of txn control
_uga_cga_large_extent_size UGA/CGA large extent size
_ultrafast_latch_statistics maintain fast-path statistics for ultrafast latches
_undo_autotune enable auto tuning of undo_retention
_undo_block_compression enable undo block compression
_undo_debug_mode debug flag for undo related operations
_undo_debug_usage invoke undo usage functions for testing
_unified_audit_flush_interval Unified Audit SGA Queue Flush Interval
_unified_audit_flush_threshold Unified Audit SGA Queue Flush Threshold
_unified_audit_policy_disabled Disable Default Unified Audit Policies on DB Create
_union_rewrite_for_gs expand queries with GSets into UNIONs for rewrite
_unnest_subquery enables unnesting of complex subqueries
_unused_block_compression enable unused block compression
_update_datafile_headers_with_space_info user requested update of datafile headers of locally managed datafiles with spac
rmation e information
_upddel_dba_hash_mask_bits controls masking of lower order bits in DBA
_use_adaptive_log_file_sync Adaptively switch between post/wait and polling
_use_best_fit use best fit to allocate space
_use_column_stats_for_function enable the use of column statistics for DDP functions
_use_hidden_partitions use hidden partitions
_use_hybrid_encryption_mode Enable platform optimized encryption in hybrid mode
_use_ism Enable Shared Page Tables - ISM
_use_ism_for_pga Use ISM for allocating large extents
_use_nosegment_indexes use nosegment indexes in explain plan
_use_platform_compression_lib Enable platform optimized compression implementation
_use_platform_encryption_lib Enable platform optimized encryption implementation
_use_realfree_heap use real-free based allocator for PGA memory
_use_seq_process_cache whether to use process local seq cache
_use_single_log_writer Use a single process for redo log writing
_use_vector_post use vector post
_use_zero_copy_io Should network vector IO interface be used for data transfer
_utlmmig_table_stats_gathering enable/disable utlmmig table stats gathering at upgrade
_uts_first_segment_retain Should we retain the first trace segment
_uts_first_segment_size Maximum size (in bytes) of first segments
_uts_trace_disk_threshold Trace disk threshold parameter
_uts_trace_segment_size Maximum size (in bytes) of a trace segment
_uts_trace_segments Maximum number of trace segments
_validate_flashback_database Scan database to validate result of flashback database
_validate_metric_groups Enable/disable SGA Metric Structure validation
_validate_readmem_redo validate redo blocks read from in-memory log buffer
_vendor_lib_loc Vendor library search root directory
_verify_fg_log_checksum LGWR verifies redo checksums generated by foreground processes
_verify_flashback_redo Verify that the redo logs needed for flashback are available
_verify_undo_quota TRUE - verify consistency of undo quota statistics
_very_large_object_threshold upper threshold level of object size for direct reads
_very_large_partitioned_table very_large_partitioned_table
_virtual_column_overload_allowed overload virtual columns expression
_vkrm_schedule_interval VKRM scheduling interval
_vktm_assert_thresh soft assert threshold VKTM timer drift
_wait_breakup_threshold_csecs Wait breakup threshold (in centiseconds)
_wait_breakup_time_csecs Wait breakup time (in centiseconds)
_wait_for_sync wait for sync on commit MUST BE ALWAYS TRUE
_wait_samples_max_sections Wait Samples maximum sections
_wait_samples_max_time_secs Wait Samples maximum time in seconds
_wait_tracker_interval_secs Wait Tracker number of seconds per interval
_wait_tracker_num_intervals Wait Tracker number of intervals
_wait_yield_hp_mode Wait Yield - High Priority Mode
_wait_yield_mode Wait Yield - Mode
_wait_yield_sleep_freq Wait Yield - Sleep Frequency
_wait_yield_sleep_time_msecs Wait Yield - Sleep Time (in milliseconds)
_wait_yield_yield_freq Wait Yield - Yield Frequency
_walk_insert_threshold maximum number of unusable blocks to walk across freelist
_watchpoint_on is the watchpointing feature turned on?
_wcr_control Oracle internal test WCR parameter used ONLY for testing!
_wcr_grv_cache_size Oracle internal: Set the replay cache size for WRR$_REPLAY_DATA.
_wcr_seq_cache_size Oracle internal: Set the replay cache size for WRR$_REPLAY_SEQ_DATA.
_widetab_comp_enabled wide table compression enabled
_windowfunc_optimization_settings settings for window function optimizations
_with_subquery WITH subquery transformation
_write_clones write clones flag
_xa_internal_retries number of internal retries for xa transactions
_xds_max_child_cursors Maximum number of XDS user-specific child cursors
_xengem_devname override default VM GEM device name used by skgvm
_xengem_diagmode set to OFF to disable VM GEM support and functionalities
_xengem_enabled Enable OVM GEM support
_xpl_peeked_binds_log_size maximum bytes for logging peeked bind values for V$SQL_PLAN (0 = OFF)
_xpl_trace Explain Plan tracing parameter
_xs_cleanup_task Triton Session Cleanup
_xs_dispatcher_only XS dispatcher only mode
_xsolapi_auto_materialization_bound OLAP API lower bound for auto materialization.
_xsolapi_auto_materialization_type OLAP API behavior for auto materialization
_xsolapi_build_trace OLAP API output build info to trace file
_xsolapi_debug_output OLAP API debug output disposition
_xsolapi_densify_cubes OLAP API cube densification
_xsolapi_dimension_group_creation OLAP API symmetric overfetch
_xsolapi_dml_trace OLAP API output dml commands and expressions to trace file
_xsolapi_fetch_type OLAP API fetch type
_xsolapi_fix_vptrs OLAP API Enable vptr fixing logic in shared server mode
_xsolapi_generate_with_clause OLAP API generates WITH clause?
_xsolapi_hierarchy_value_type OLAP API hierarchy value type
_xsolapi_load_at_process_start When to load OLAP API library at server process start
_xsolapi_materialization_rowcache_min_ro OLAP API min number of rows required to use rowcache in query materialization
ws_for_use
_xsolapi_materialize_sources OLAP API Enable source materialization
_xsolapi_metadata_reader_mode OLAP API metadata reader mode
_xsolapi_odbo_mode OLAP API uses ODBO mode?
_xsolapi_opt_aw_position OLAP API enables AW position and count optimization?
_xsolapi_optimize_suppression OLAP API optimizes suppressions?
_xsolapi_precompute_subquery OLAP API precomputes subqueries?
_xsolapi_remove_columns_for_materializat OLAP API removes columns for materialization?
ion
_xsolapi_set_nls OLAP API sets NLS?
_xsolapi_share_executors OLAP API share executors?
_xsolapi_source_trace OLAP API output Source definitions to trace file
_xsolapi_sql_all_multi_join_non_base_hin OLAP API multi-join non-base hints
ts
_xsolapi_sql_all_non_base_hints OLAP API non-base hints
_xsolapi_sql_auto_dimension_hints OLAP API enable automatic dimension hints
_xsolapi_sql_auto_measure_hints OLAP API enable automatic measure hints
_xsolapi_sql_dimension_hints OLAP API dimension hints
_xsolapi_sql_enable_aw_join OLAP API enables AW join?
_xsolapi_sql_enable_aw_qdr_merge OLAP API enables AW QDR merge?
_xsolapi_sql_hints OLAP API generic hints
_xsolapi_sql_measure_hints OLAP API measure hints
_xsolapi_sql_minus_threshold OLAP API SQL MINUS threshold
_xsolapi_sql_optimize OLAP API enable optimization
_xsolapi_sql_prepare_stmt_cache_size OLAP API prepare statement cache size
_xsolapi_sql_remove_columns OLAP API enable remove unused columns optimizations
_xsolapi_sql_result_set_cache_size OLAP API result set cache size
_xsolapi_sql_symmetric_predicate OLAP API enable symmetric predicate for dimension groups
_xsolapi_sql_top_dimension_hints OLAP API top dimension hints
_xsolapi_sql_top_measure_hints OLAP API top measure hints
_xsolapi_sql_use_bind_variables OLAP API enable bind variables optimization
_xsolapi_stringify_order_levels OLAP API stringifies order levels?
_xsolapi_support_mtm OLAP API MTM mapping classes supported?
_xsolapi_suppression_aw_mask_threshold OLAP API suppression AW mask threshold
_xsolapi_suppression_chunk_size OLAP API suppression chunk size
_xsolapi_use_models OLAP API uses models?
_xsolapi_use_olap_dml OLAP API uses OLAP DML?
_xsolapi_use_olap_dml_for_rank OLAP API uses OLAP DML for rank?
_xt_coverage external tables code coverage parameter
_xt_trace external tables trace parameter
_xtbuffer_size buffer size in KB needed for populate/query operation
_xtts_allow_pre10 allow cross platform for pre10 compatible tablespace
_xtts_set_platform_info set cross platform info during file header read
_zonemap_control control different uses/algorithms related to zonemaps
_zonemap_staleness_tracking control the staleness tracking of zonemaps via trigger
_zonemap_use_enabled enable the use of zonemaps for IO pruning