须要更新的数据有1100条。我连接的时候一直报错
ORA-12518, TNS:listener could not hand off client connection
依据商品的文章设置了最大连接数为：1200。session为1200*1.1+5=1325。可是tomcat还是报错
ORA-12518, TNS:listener could not
hand off client connection
查看最大连接数：
SQL> show parameter processes;NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes integer 0
db_writer_processes integer 1
gcs_server_processes integer 0
job_queue_processes integer 10
log_archive_max_processes integer 2
processes integer 1200
查看当前的的数据库v$processes 仅仅有356，v$session 352
PMON每5分钟更新listener中的内容，所以listener和数据库不一定是同步的，你如今从数据库上得知有356个连接。并不代表listener里面记录的是356个， 5分钟之内非常可能还没有被pmon更新，依旧保持着1200所以你报错ORA-12518 而不是ora-00020
SQL> show parameter pga; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ pga_aggregate_target big integer 194M SQL> select * from v$resource_limit; RESOURCE_NAME CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_ALLOCATION LIMIT_VALUE ------------------------------ ------------------- --------------- -------------------- -------------------- processes 24 366 1200 1200 sessions 27 362 1325 1325 enqueue_locks 15 25 15950 15950 enqueue_resources 15 43 6048 UNLIMITED ges_procs 0 0 0 0 ges_ress 0 0 0 UNLIMITED ges_locks 0 0 0 UNLIMITED ges_cache_ress 0 0 0 UNLIMITED ges_reg_msgs 0 0 0 UNLIMITED ges_big_msgs 0 0 0 UNLIMITED ges_rsv_msgs 0 0 0 0 gcs_resources 0 0 0 0 gcs_shadows 0 0 0 0 dml_locks 0 51 5828 UNLIMITED temporary_table_locks 0 3 UNLIMITED UNLIMITED transactions 1 7 1457 UNLIMITED branches 0 0 1457 UNLIMITED cmtcallbk 0 2 1457 UNLIMITED sort_segment_locks 0 3 UNLIMITED UNLIMITED max_rollback_segments 11 11 1457 65535 RESOURCE_NAME CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_ALLOCATION LIMIT_VALUE ------------------------------ ------------------- --------------- -------------------- -------------------- max_shared_servers 1 1 UNLIMITED UNLIMITED parallel_max_servers 0 0 40 3600 22 rows selected