SQL> alter system set log_checkpoints_to_alert=TRUE;
系统已更改。
LOG_CHECKPOINTS_TO_ALERT lets you log your checkpoints to the alert file. Doing so is useful for determining whether checkpoints are occurring at the desired frequency
1. 实例级别的回滚(当然也是事务级别）
+++++++Session 1
SQL> select count(*) from test;
COUNT(*)
----------
2782688
SQL> delete from test;
已删除2782688行。
+++++++Session 2
Oracle Corporation SunOS 5.10 Generic Patch January 2005
-bash-3.2$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on 星期日 8月 24 15:36:35 2014
Copyright (c) 1982, 2013, Oracle. All rights reserved.
连接到:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> show user
USER 为 "SYS"
SQL> shutdown abort;
ORACLE 例程已经关闭。
SQL> startup mount;
ORACLE 例程已经启动。
Total System Global Area 1887350784 bytes
Fixed Size 2251968 bytes
Variable Size 973079360 bytes
Database Buffers 905969664 bytes
Redo Buffers 6049792 bytes
数据库装载完毕。
SQL> oradebug setmypid
已处理的语句
SQL> oradebug event 10015 trace name context forever,level 10;
已处理的语句
SQL> alter database open;
数据库已更改。
SQL> oradebug event 10015 trace name context off;
已处理的语句
SQL> oradebug close_trace
已处理的语句
SQL> oradebug tracefile_name
/oracle/app/diag/rdbms/june/june/trace/june_ora_4046.trc
SQL> select usn,status from v$rollstat order by 1;
USN STATUS
---------- ---------------
0 ONLINE
1 ONLINE
2 ONLINE
3 ONLINE
4 ONLINE
5 ONLINE
6 ONLINE
7 ONLINE
8 ONLINE
9 ONLINE
10 ONLINE
Shutting down instance (abort)
License high water mark = 18
USER (ospid: 4017): terminating the instance
Instance terminated by USER, pid = 4017
Sun Aug 24 15:36:44 2014
Instance shutdown complete
Sun Aug 24 15:37:11 2014
Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Initial number of CPU is 1
Number of processor cores in the system is 1
Number of processor sockets in the system is 1
CELL communication is configured to use 0 interface(s):
CELL IP affinity details:
NUMA status: non-NUMA system
cellaffinity.ora status: N/A
CELL communication will use 1 IP group(s):
Grp 0:
Picked latch-free SCN scheme 3
Using LOG_ARCHIVE_DEST_1 parameter default value as /oracle/app/product/11.2.0/dbhome_1/dbs/arch
Autotune of undo retention is turned on.
IMODE=BR
ILAT =249
LICENSE_MAX_USERS = 0
SYS auditing is disabled
Starting up:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options.
ORACLE_HOME = /oracle/app/product/11.2.0/dbhome_1
System name: SunOS
Node name: solaris
Release: 5.10
Version: Generic_147148-26
Machine: i86pc
Using parameter settings in server-side spfile /oracle/app/product/11.2.0/dbhome_1/dbs/spfilejune.ora
System parameters with non-default values:
processes = 1500
sessions = 2272
nls_language = "SIMPLIFIED CHINESE"
nls_territory = "CHINA"
sga_target = 1808M
control_files = "/oracle/june/control01.ctl"
control_files = "/oracle/june/control02.ctl"
db_block_size = 8192
compatible = "11.2.0.4.0"
undo_tablespace = "UNDOTBS1"
remote_login_passwordfile= "EXCLUSIVE"
db_domain = ""
dispatchers = "(PROTOCOL=TCP) (SERVICE=juneXDB)"
audit_file_dest = "/oracle/app/admin/june/adump"
audit_trail = "DB"
db_name = "june"
open_cursors = 300
pga_aggregate_target = 200M
diagnostic_dest = "/oracle/app"
Sun Aug 24 15:37:21 2014
PMON started with pid=2, OS id=4022
Sun Aug 24 15:37:21 2014
PSP0 started with pid=3, OS id=4023
Sun Aug 24 15:37:21 2014
VKTM started with pid=4, OS id=4024 at elevated priority
VKTM running at (10)millisec precision with DBRM quantum (100)ms
Sun Aug 24 15:37:21 2014
GEN0 started with pid=5, OS id=4027
Sun Aug 24 15:37:21 2014
DIAG started with pid=6, OS id=4028
Sun Aug 24 15:37:21 2014
DBRM started with pid=7, OS id=4029
Sun Aug 24 15:37:21 2014
DIA0 started with pid=8, OS id=4030
Sun Aug 24 15:37:21 2014
MMAN started with pid=9, OS id=4031
Sun Aug 24 15:37:22 2014
DBW0 started with pid=10, OS id=4032
Sun Aug 24 15:37:22 2014
LGWR started with pid=11, OS id=4033 at elevated priority
Sun Aug 24 15:37:22 2014
CKPT started with pid=12, OS id=4036
Sun Aug 24 15:37:22 2014
SMON started with pid=13, OS id=4037
Sun Aug 24 15:37:22 2014
RECO started with pid=14, OS id=4038
Sun Aug 24 15:37:22 2014
MMON started with pid=15, OS id=4039
Sun Aug 24 15:37:22 2014
starting up 1 dispatcher(s) for network address '(ADDRESS=(PARTIAL=YES)(PROTOCOL=TCP))'...
Sun Aug 24 15:37:22 2014
MMNL started with pid=16, OS id=4040
starting up 1 shared server(s) ...
ORACLE_BASE from environment = /oracle/app
Sun Aug 24 15:37:23 2014
ALTER DATABASE MOUNT
Successful mount of redo thread 1, with mount id 751060083
Database mounted in Exclusive Mode
Lost write protection disabled
Completed: ALTER DATABASE MOUNT
Sun Aug 24 15:37:46 2014
alter database open
Beginning crash recovery of 1 threads
Started redo scan
Completed redo scan
read 82282 KB redo, 9128 data blocks need recovery
Started redo application at
Thread 1: logseq 36, block 8850
Recovery of Online Redo Log: Thread 1 Group 3 Seq 36 Reading mem 0
Mem# 0: /oracle/june/redo03.log
Recovery of Online Redo Log: Thread 1 Group 1 Seq 37 Reading mem 0
Mem# 0: /oracle/june/redo01.log
Completed redo application of 70.26MB
Completed crash recovery at
Thread 1: logseq 37, block 75407, scn 1057882
9128 data blocks read, 9128 data blocks written, 82282 redo k-bytes read
Sun Aug 24 15:37:53 2014
Thread 1 advanced to log sequence 38 (thread open)
Thread 1 opened at log sequence 38
Current log# 2 seq# 38 mem# 0: /oracle/june/redo02.log
Successful open of redo thread 1
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Sun Aug 24 15:37:53 2014
SMON: enabling cache recovery
Sun Aug 24 15:37:56 2014
[4046] Successfully onlined Undo Tablespace 2.
Undo initialization finished serial:0 start:63078044 end:63079818 diff:1774 (17 seconds)
Verifying file header compatibility for 11g tablespace encryption..
Verifying 11g file header compatibility for tablespace encryption completed
SMON: enabling tx recovery
Database Characterset is ZHS16GBK
No Resource Manager plan active
replication_dependency_tracking turned off (no async multimaster replication found)
Starting background process QMNC
Sun Aug 24 15:38:01 2014
QMNC started with pid=21, OS id=4049
Sun Aug 24 15:38:12 2014
Completed: alter database open
Sun Aug 24 15:38:21 2014
Starting background process CJQ0
Sun Aug 24 15:38:21 2014
CJQ0 started with pid=25, OS id=4059
Sun Aug 24 15:38:23 2014
Thread 1 advanced to log sequence 39 (LGWR switch)
Current log# 3 seq# 39 mem# 0: /oracle/june/redo03.log
Setting Resource Manager plan SCHEDULER[0x32DF]:DEFAULT_MAINTENANCE_PLAN via scheduler window
Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter
Sun Aug 24 15:38:25 2014
Starting background process VKRM
Sun Aug 24 15:38:25 2014
VKRM started with pid=24, OS id=4060
Thread 1 advanced to log sequence 40 (LGWR switch)
Current log# 1 seq# 40 mem# 0: /oracle/june/redo01.log
Sun Aug 24 15:38:37 2014
Thread 1 cannot allocate new log, sequence 41
Checkpoint not complete
Current log# 1 seq# 40 mem# 0: /oracle/june/redo01.log
Thread 1 advanced to log sequence 41 (LGWR switch)
Current log# 2 seq# 41 mem# 0: /oracle/june/redo02.log
Sun Aug 24 15:38:50 2014
Thread 1 cannot allocate new log, sequence 42
Checkpoint not complete
Current log# 2 seq# 41 mem# 0: /oracle/june/redo02.log
Thread 1 advanced to log sequence 42 (LGWR switch)
Current log# 3 seq# 42 mem# 0: /oracle/june/redo03.log
前滚用redo完成,在数据库打开之前
回滚是利用Undo,在数据库打开之后