第八章：REDO日志（2）
8、日志恢复
1、多元化成员中，单个成员丢失
05:10:06 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 9 10485760 2 NO INACTIVE 384007 02-AUG-11
3 1 8 10485760 2 NO INACTIVE 384005 02-AUG-11
2 1 10 10485760 2 NO CURRENT 385481 02-AUG-11
05:10:12 SQL> !
[oracle@oracle ~]$ ls /disk2/lx01/oradata/
control03.ctl redo01a.log redo02a.log redo03a.log redo04a.log redo05a.log
[oracle@oracle ~]$ exit
exit
05:14:31 SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
05:14:41 SQL> !
[oracle@oracle ~]$ rm /disk2/lx02/oradata/redo01a.log
[oracle@oracle ~]$ !sql
sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 2 05:15:02 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
05:15:02 SQL> startup
ORACLE instance started.
Total System Global Area 251658240 bytes
Fixed Size 1218820 bytes
Variable Size 125830908 bytes
Database Buffers 121634816 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
05:15:12 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 9 10485760 2 NO INACTIVE 384007 02-AUG-11
3 1 8 10485760 2 NO INACTIVE 384005 02-AUG-11
2 1 10 10485760 2 NO CURRENT 385481 02-AUG-11
05:15:24 SQL> desc v$logfile;
Name Null? Type
----------------------------------------------------------------------------------- -------- --------------------------------------------------------
GROUP# NUMBER
STATUS VARCHAR2(7)
TYPE VARCHAR2(7)
MEMBER VARCHAR2(513)
IS_RECOVERY_DEST_FILE VARCHAR2(3）
05:15:43 SQL> col member for a50
05:15:48 SQL> r
1* select group#,member ,status from v$logfile
GROUP# MEMBER STATUS
---------- -------------------------------------------------- -------
2 /disk2/lx02/oradata/redo02a.log
1 /disk2/lx02/oradata/redo01a.log INVALID
3 /disk2/lx02/oradata/redo03a.log
1 /disk1/lx02/oradata/redo01b.log
2 /disk1/lx02/oradata/redo02b.log
3 /disk1/lx02/oradata/redo03b.log
6 rows selected.
05:15:48 SQL>
告警日志：
Errors in file /u01/app/oracle/admin/lx02/bdump/lx02_lgwr_9105.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/disk2/lx02/oradata/redo01a.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
解决：
05:15:48 SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
05:17:47 SQL> !
[oracle@oracle ~]$ cp /disk1/lx02/oradata/redo01b.log /disk2/lx02/oradata/redo01a.log
[oracle@oracle ~]$ !sql
sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 2 05:18:02 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
05:18:02 SQL> startup
ORACLE instance started.
Total System Global Area 251658240 bytes
Fixed Size 1218820 bytes
Variable Size 125830908 bytes
Database Buffers 121634816 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
05:18:14 SQL> col member for a50
05:18:26 SQL> select group#,member ,status from v$logfile
05:18:29 2 ;
GROUP# MEMBER STATUS
---------- -------------------------------------------------- -------
2 /disk2/lx02/oradata/redo02a.log
1 /disk2/lx02/oradata/redo01a.log INVALID
3 /disk2/lx02/oradata/redo03a.log
1 /disk1/lx02/oradata/redo01b.log
2 /disk1/lx02/oradata/redo02b.log
3 /disk1/lx02/oradata/redo03b.log
6 rows selected.
05:18:31 SQL> alter system switch logfile;
System altered.
05:18:37 SQL> /
System altered.
05:18:39 SQL> select group#,member ,status from v$logfile
05:18:40 2 ;
GROUP# MEMBER STATUS
---------- -------------------------------------------------- -------
2 /disk2/lx02/oradata/redo02a.log
1 /disk2/lx02/oradata/redo01a.log
3 /disk2/lx02/oradata/redo03a.log
1 /disk1/lx02/oradata/redo01b.log
2 /disk1/lx02/oradata/redo02b.log
3 /disk1/lx02/oradata/redo03b.log
6 rows selected.
05:18:42 SQL>
2、非当前日志组所有成员丢失
05:19:42 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 12 10485760 2 NO CURRENT 386507 02-AUG-11
3 1 11 10485760 2 NO INACTIVE 386505 02-AUG-11
2 1 10 10485760 2 NO INACTIVE 385481 02-AUG-11
05:19:45 SQL>
05:19:45 SQL> shutdown
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
05:19:59 SQL> !
[oracle@oracle ~]$ rm /disk2/lx02/oradata/redo02a.log
[oracle@oracle ~]$ rm /disk1/lx02/oradata/redo02b.log
[oracle@oracle ~]$ !sql
sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 2 05:20:21 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
05:20:22 SQL> startup
ORACLE instance started.
Total System Global Area 251658240 bytes
Fixed Size 1218820 bytes
Variable Size 125830908 bytes
Database Buffers 121634816 bytes
Redo Buffers 2973696 bytes
Database mounted.
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/disk2/lx02/oradata/redo02a.log'
ORA-00312: online log 2 thread 1: '/disk1/lx02/oradata/redo02b.log'
05:20:29 SQL> alter database clear logfile group 2;
Database altered.
05:21:00 SQL> alter database open;
Database altered.
05:21:08 SQL>
3、当前日志组丢失（正常关库 shutdown immediate）
05:22:16 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 12 10485760 2 NO INACTIVE 386507 02-AUG-11
3 1 14 10485760 2 NO CURRENT 386751 02-AUG-11
2 1 13 10485760 2 NO ACTIVE 386654 02-AUG-11
05:22:17 SQL>
05:22:17 SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
05:22:36 SQL> !
[oracle@oracle ~]$ rm /disk2/lx02/oradata/redo03a.log
[oracle@oracle ~]$ rm /disk1/lx02/oradata/redo03b.log
[oracle@oracle ~]$ !sql
sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 2 05:23:03 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
05:23:03 SQL> startup
ORACLE instance started.
Total System Global Area 251658240 bytes
Fixed Size 1218820 bytes
Variable Size 125830908 bytes
Database Buffers 121634816 bytes
Redo Buffers 2973696 bytes
Database mounted.
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/disk2/lx02/oradata/redo03a.log'
ORA-00312: online log 3 thread 1: '/disk1/lx02/oradata/redo03b.log'
05:23:10 SQL>
告警日志：
Errors in file /u01/app/oracle/admin/lx02/bdump/lx02_lgwr_9314.trc:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/disk1/lx02/oradata/redo03b.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00312: online log 3 thread 1: '/disk2/lx02/oradata/redo03a.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Tue Aug 2 05:23:10 2011
Errors in file /u01/app/oracle/admin/lx02/bdump/lx02_lgwr_9314.trc:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/disk1/lx02/oradata/redo03b.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00312: online log 3 thread 1: '/disk2/lx02/oradata/redo03a.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-313 signalled during: ALTER DATABASE OPEN...
解决：
05:23:10 SQL> alter database clear logfile group 3;
alter database clear logfile group 3
*
ERROR at line 1:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/disk1/lx02/oradata/redo03b.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00312: online log 3 thread 1: '/disk2/lx02/oradata/redo03a.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
--------对于当前日志组不能clear
05:24:04 SQL> recover database until cancel;
Media recovery complete.
05:24:23 SQL> alter database open resetlogs;
Database altered.
05:24:41 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 2 10485760 2 NO CURRENT 386892 02-AUG-11
3 1 1 10485760 2 NO INACTIVE 386891 02-AUG-11
2 1 0 10485760 2 YES UNUSED 0
05:24:44 SQL> alter system switch logfile;
System altered.
05:26:28 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 2 10485760 2 NO ACTIVE 386892 02-AUG-11
3 1 1 10485760 2 NO INACTIVE 386891 02-AUG-11
2 1 3 10485760 2 NO CURRENT 387003 02-AUG-11
05:26:29 SQL>
--------------非正常关库，当前日志组文件丢失
修改pfile文件，添加_allow_resetlogs_corruption=TRUE
[oracle@work dbs]$ vi inittest.ora
_allow_resetlogs_corruption=TRUE
*.background_dump_dest='$ORACLE_BASE/admin/test/bdump'
*.control_files='/u01/app/oracle/oradata/test/control01.ctl','/disk1/oradata/test/control02.ctl','/disk2/oradata/test/control03.ctl'
*.core_dump_dest='$ORACLE_BASE/admin/test/cdump'
*.db_block_size=8192
*.db_cache_size=80M#DEMO
*.db_file_multiblock_read_count=16
*.db_name='test'
*.optimizer_mode='choose'
*.parallel_threads_per_cpu=4#SMALL
*.pga_aggregate_target=10485760
*.query_rewrite_enabled='true'
*.query_rewrite_integrity='trusted'
*.shared_pool_size=60M#DEMO
*.star_transformation_enabled='true'
*.undo_management='auto'
*.undo_tablespace='rtbs'
*.user_dump_dest='$ORACLE_BASE/admin/test/udump'
---------再以pfile 启动instance 到mount
然后 alter database open resetlogs
