第五章： 手工完全恢复
-------------非归档模式
案例1： 历史日志没有被覆盖
1）切换到非归档模式
06:58:57 SQL>
06:58:57 SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /disk1/arch/prod
Oldest online log sequence 45
Next log sequence to archive 47
Current log sequence 47
06:59:04 SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
07:00:15 SQL> startup mount
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1219184 bytes
Variable Size 79693200 bytes
Database Buffers 230686720 bytes
Redo Buffers 2973696 bytes
Database mounted.
07:00:27 SQL> alter database noarchivelog;
Database altered.
07:00:33 SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination /disk1/arch/prod
Oldest online log sequence 45
Current log sequence 47
07:00:35 SQL> alter database open;
Database altered.
07:00:45 SQL> !
[oracle@work ~]$ ls /disk1/backup/prod/close_bak/*
/disk1/backup/prod/close_bak/control02.ctl /disk1/backup/prod/close_bak/sysaux01.dbf /disk1/backup/prod/close_bak/undo_tbs01.dbf
/disk1/backup/prod/close_bak/control03.ctl /disk1/backup/prod/close_bak/system01.dbf /disk1/backup/prod/close_bak/users01.dbf
/disk1/backup/prod/close_bak/example01.dbf /disk1/backup/prod/close_bak/test01.dbf
/disk1/backup/prod/close_bak/index01.dbf /disk1/backup/prod/close_bak/test02.dbf
[oracle@work ~]$ rm /disk1/backup/prod/close_bak/*
[oracle@work ~]$ rm /disk1/arch/prod/*
[oracle@work ~]$ exit
exit
2）重新做数据库的全备（一致性备份-冷备份）
-------备份所有的datafile 和 controlfile
3）模拟环境
SQL> select * from v$log
2 ;
1 1 47 52428800 1 NO CURRENT 1250545 16-AUG-11
2 1 45 52428800 1 YES INACTIVE 1209278 16-AUG-11
3 1 46 52428800 1 YES INACTIVE 1229885 16-AUG-11
SQL> select * from scott.test;
1
2
3
4
5
6
7
8
SQL> set heading on
SQL> insert into scott.test values (9);
SQL> insert into scott.test values (10);
SQL> insert into scott.test values (11);
SQL> commit;
SQL> select * from v$log;
1 1 47 52428800 1 NO CURRENT 1250545 16-AUG-11
2 1 45 52428800 1 YES INACTIVE 1209278 16-AUG-11
3 1 46 52428800 1 YES INACTIVE 1229885 16-AUG-11
QL> select segment_name,tablespace_NAME from dba_segments
2 where segment_name='TEST';
TEST USERS
SQL> SHUTDOWN ABORT
ORACLE instance shut down.
2) 删除数据文件
[oracle@work ~]$ rm /u01/app/oracle/oradata/prod/users01.dbf
3）启动数据库
07:06:22 SQL> startup
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1219184 bytes
Variable Size 79693200 bytes
Database Buffers 230686720 bytes
Redo Buffers 2973696 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: '/u01/app/oracle/oradata/prod/users01.dbf'
07:06:41 SQL> select file#,error from v$recover_file;
FILE# ERROR
---------- -----------------------------------------------------------------
2 FILE NOT FOUND
4）恢复
-----------restore datafile
[oracle@work ~]$ cp /disk1/backup/prod/close_bak/users01.dbf /u01/app/oracle/oradata/prod/
---------recover datafile
07:07:37 SQL> recover datafile 2;
告警日志信息：
ALTER DATABASE RECOVER datafile 2
Tue Aug 16 07:07:56 2011
Media Recovery Start
Tue Aug 16 07:07:56 2011
Recovery of Online Redo Log: Thread 1 Group 1 Seq 47 Reading mem 0
Mem# 0 errs 0: /u01/app/oracle/oradata/prod/redo01.log
Tue Aug 16 07:07:57 2011
Media Recovery Complete (prod)
Completed: ALTER DATABASE RECOVER datafile 2
Media recovery complete.
5）验证
07:08:00 SQL> alter database open;
Database altered.
07:08:08 SQL> select * from scott.test;
ID
----------
9
10
11
1
2
3
4
5
6
7
8
11 rows selected.
07:08:14 SQL>
案例2：日志发生切换，历史日志已经被覆盖
1）模拟环境
07:08:14 SQL> insert into scott.test values (12);
1 row created.
07:10:17 SQL> insert into scott.test values (13);
1 row created.
07:10:20 SQL> insert into scott.test values (14);
1 row created.
07:10:22 SQL> insert into scott.test values (15);
1 row created.
07:10:24 SQL> commit;
Commit complete.
07:10:25 SQL> alter system switch logfile;
System altered.
07:10:34 SQL> /
System altered.
07:10:39 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 50 52428800 1 NO INACTIVE 1272776 16-AUG-11
2 1 51 52428800 1 NO ACTIVE 1272779 16-AUG-11
3 1 52 52428800 1 NO CURRENT 1272781 16-AUG-11
07:10:43 SQL> alter system switch logfile;
System altered.
07:10:45 SQL> alter system switch logfile;
System altered.
07:10:51 SQL> select * from scott.test;
ID
----------
9
10
11
1
2
3
12
13
14
15
4
5
6
7
8
15 rows selected.
07:10:57 SQL>
07:10:57 SQL> shutdown abort
ORACLE instance shut down.
07:11:35 SQL> !
[oracle@work ~]$ rm /u01/app/oracle/oradata/prod/users01.dbf
2）启动数据库
07:11:54 SQL> startup
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1219184 bytes
Variable Size 79693200 bytes
Database Buffers 230686720 bytes
Redo Buffers 2973696 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: '/u01/app/oracle/oradata/prod/users01.dbf'
07:12:02 SQL> select file#,error from v$recover_file;
FILE# ERROR
---------- -----------------------------------------------------------------
2 FILE NOT FOUND
3）恢复
--------------restore datafile
cp /disk1/backup/prod/close_bak/users01.dbf /u01/app/oracle/oradata/prod/
---------recover datafile
07:13:11 SQL> recover datafile 2;
ORA-00279: change 1252332 generated at 08/16/2011 07:02:01 needed for thread 1
ORA-00289: suggestion : /disk1/arch/prod/arch_47_1_758481658.log
ORA-00280: change 1252332 for thread 1 is in sequence #47
07:13:15 Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
ORA-00308: cannot open archived log '/disk1/arch/prod/arch_47_1_758481658.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log '/disk1/arch/prod/arch_47_1_758481658.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
-------需要归档日志。。。。。。。。。。。。。。。。
-----------恢复需要转储所有的控制文件和datafile
07:13:20 SQL> select name from v$controlfile;
NAME
------------------------------------------------------------------------------------------------------------------------
/u01/app/oracle/oradata/prod/control02.ctl
/u01/app/oracle/oradata/prod/control03.ctl
07:14:12 SQL> shutdown
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
07:14:21 SQL> !
[oracle@work ~]$ cp /disk1/backup/prod/close_bak/control* /u01/app/oracle/oradata/prod/
[oracle@work ~]$ cp /disk1/backup/prod/close_bak/*.dbf /u01/app/oracle/oradata/prod/
-------------启动数据库到mount
07:15:58 SQL> startup mount
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1219184 bytes
Variable Size 79693200 bytes
Database Buffers 230686720 bytes
Redo Buffers 2973696 bytes
Database mounted.
07:16:11 SQL> select file#,checkpoint_change# from v$datafile;
FILE# CHECKPOINT_CHANGE#
---------- ------------------
1 1252332
2 1252332
3 1252332
4 1252332
5 1252332
6 1252332
7 1252332
8 1252332
9 1252332
9 rows selected.
07:16:30 SQL> select file#,checkpoint_change# from v$datafile_header;
FILE# CHECKPOINT_CHANGE#
---------- ------------------
1 1252332
2 1252332
3 1252332
4 1252332
5 1252332
6 1252332
7 1252332
8 1252332
9 1252332
9 rows selected.
07:16:35 SQL>
07:16:35 SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-00314: log 1 of thread 1, expected sequence# doesn't match
ORA-00312: online log 1 thread 1: '/u01/app/oracle/oradata/prod/redo01.log'
---------如果此刻直接打开库，因为redo log 和controlfile、datafile 不同步，不能直接打开
07:17:07 SQL> recover database until cancel;
Media recovery complete.
------做不完全恢复
07:17:17 SQL> alter database open resetlogs;
Database altered.
------对database进行resetlogs 方式打开
查看告警日志信息：
ALTER DATABASE RECOVER database until cancel
Tue Aug 16 07:17:17 2011
Media Recovery Start
Media Recovery Not Required
Completed: ALTER DATABASE RECOVER database until cancel
Tue Aug 16 07:17:22 2011
alter database open resetlogs
RESETLOGS after complete recovery through change 1252332
Resetting resetlogs activation ID 170334582 (0xa271976)
Tue Aug 16 07:17:27 2011
Setting recovery target incarnation to 3
Tue Aug 16 07:17:27 2011
Assigning activation ID 171172278 (0xa33e1b6)
Thread 1 advanced to log sequence 2
Thread 1 opened at log sequence 2
Current log# 2 seq# 2 mem# 0: /u01/app/oracle/oradata/prod/redo02.log
Successful open of redo thread 1
07:17:38 SQL>
-------验证
07:17:38 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 1 52428800 1 NO INACTIVE 1252333 16-AUG-11
2 1 2 52428800 1 NO CURRENT 1252334 16-AUG-11
3 1 0 52428800 1 YES UNUSED 0
07:19:22 SQL>
---------数据库被resetlog ，建议立刻做一个数据库的全备。
07:19:22 SQL> select * from scott.test;
ID
----------
1
2
3
4
5
6
7
8
8 rows selected.
----------只能恢复到最后一次备份
11、控制文件和redo 日志文件恢复
控制文件恢复
单个文件丢失：
[oracle@oracle dbs]$ rm /disk2/lx02/oradata/control03.ctl
[oracle@oracle dbs]$ sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Aug 1 06:14:54 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
06:14:54 SQL> startup
ORACLE instance started.
Total System Global Area 176160768 bytes
Fixed Size 1218364 bytes
Variable Size 88082628 bytes
Database Buffers 83886080 bytes
Redo Buffers 2973696 bytes
ORA-00205: error in identifying control file, check alert log for more info
通过告警日志获得信息：
ALTER DATABASE MOUNT
Mon Aug 1 06:14:57 2011
ORA-00202: control file: '/disk2/lx02/oradata/control03.ctl'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
06:14:57 SQL> shutdown
ORA-01507: database not mounted
ORACLE instance shut down.
06:15:14 SQL> !
[oracle@oracle dbs]$ cp /disk1/lx02/oradata/control02.ctl /disk2/lx02/oradata/control03.ctl
[oracle@oracle dbs]$ sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Aug 1 06:15:36 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
06:15:37 SQL> startup
ORACLE instance started.
Total System Global Area 176160768 bytes
Fixed Size 1218364 bytes
Variable Size 88082628 bytes
Database Buffers 83886080 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
06:15:47 SQL> select name from v$controlfile;
NAME
------------------------------------------------------------------------------------------------------------------------------------------------------
/u01/app/oracle/oradata/lx02/control01.ctl
/disk1/lx02/oradata/control02.ctl
/disk2/lx02/oradata/control03.ctl
06:16:00 SQL>
所有的文件丢失：
06:16:00 SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
06:17:22 SQL> !
[oracle@oracle dbs]$ rm /u01/app/oracle/oradata/lx02/control01.ctl
[oracle@oracle dbs]$ rm /disk1/lx02/oradata/control02.ctl
[oracle@oracle dbs]$ rm /disk2/lx02/oradata/control03.ctl
[oracle@oracle dbs]$ sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Aug 1 06:17:51 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
06:17:51 SQL> startup
ORACLE instance started.
Total System Global Area 176160768 bytes
Fixed Size 1218364 bytes
Variable Size 88082628 bytes
Database Buffers 83886080 bytes
Redo Buffers 2973696 bytes
ORA-00205: error in identifying control file, check alert log for more info
告警日志：
ALTER DATABASE MOUNT
Mon Aug 1 06:17:54 2011
ORA-00202: control file: '/u01/app/oracle/oradata/lx02/control01.ctl'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Mon Aug 1 06:17:54 2011
利用trace 文件重建
在nomount 状态
06:19:51 SQL>CREATE CONTROLFILE REUSE DATABASE "LX02" RESETLOGS NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 2
MAXDATAFILES 30
MAXINSTANCES 1
MAXLOGHISTORY 292
LOGFILE
GROUP 1 '/u01/app/oracle/oradata/lx02/redo01a.log' SIZE 10M,
GROUP 2 '/u01/app/oracle/oradata/lx02/redo02a.log' SIZE 10M
-- STANDBY LOGFILE
DATAFILE
'/u01/app/oracle/oradata/lx02/system01.dbf',
'/u01/app/oracle/oradata/lx02/rtbs01.dbf',
'/u01/app/oracle/oradata/lx02/sysaux01.dbf',
'/u01/app/oracle/oradata/lx02/user01.dbf',
'/u01/app/oracle/oradata/lx02/example01.dbf',
'/u01/app/oracle/oradata/lx02/indx01.dbf',
'/u01/app/oracle/oradata/lx02/OLTP01.DBF'
CHARACTER SET ZHS16GBK
06:21:23 20 ;
Control file created.
06:21:27 SQL> alter database open resetlogs;
Database altered.
06:21:39 SQL>
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
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>
