Oracle redo损坏的处理

如果光是INACTIVE状态的redo损坏，有三种方法可以恢复： 1.clear logfile 相关命令： alter database clear logfile

如果光是INACTIVE状态的redo损坏，有三种方法可以恢复：

1.clear logfile

相关命令：

alter database clear logfile '/database/oradata/skyread/redo04.log'; --已经归档的操作

alter database clear unarchived logfile '/database/oradata/skyread/redo04.log'; --inactive未归档的操作

2.不完全恢复until cancel

启动到mount状态运行recover database until cancel;

3.重建控制文件resetlogs方法

采用重建控制文件脚本resetlogs的方式重建，应用相关redo，完成介质恢复，resetlogs不检查日志文件，，所以不会报错

活动的在线日志损坏而且异常关闭的恢复：

SQL> alter database backup controlfile to trace as '/home/Oracle/ctl.sql' reuse resetlogs;

Database altered.

SQL> create table t1 as select * from dba_objects;

Table created.

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME

---------------- ---------------- ---------------- ---------------- ---------------- --- ---------------- ---------------- -------------------

1 1 31 536870912 1 YES INACTIVE 122695597193 2013-05-29 14:41:24

2 1 32 536870912 1 YES INACTIVE 122695676280 2013-05-31 13:38:04

3 1 29 536870912 1 YES INACTIVE 122695590894 2013-05-29 10:29:29

4 1 33 536870912 1 YES ACTIVE 122695698110 2013-05-31 14:15:47

5 1 34 536870912 1 NO CURRENT 122695861946 2013-06-04 13:48:31

破坏活动归档的日志文件，破坏控制文件，异常关机：

SQL> shutdown abort;

ORACLE instance shut down.

启动到mount状态时报错：

SQL> startup;

ORACLE instance started.

Total System Global Area 5049942016 bytes

Fixed Size 2090880 bytes

Variable Size 1375733888 bytes

Database Buffers 3657433088 bytes

Redo Buffers 14684160 bytes

ORA-00205: error in identifying control file, check alert log for more info

重建控制文件,注意如果是noresetlogs是不成功的，这里由于redo04.log损坏，只能采用resetlogs，不检查日志文件

SQL> CREATE CONTROLFILE REUSE DATABASE "SKYREAD" NORESETLOGS FORCE LOGGING ARCHIVELOG

2 MAXLOGFILES 20

3 MAXLOGMEMBERS 5

4 MAXDATAFILES 1000

5 MAXINSTANCES 8

6 MAXLOGHISTORY 2337

7 LOGFILE

8 GROUP 1 '/database/oradata/skyread/redo01.log' SIZE 512M,

9 GROUP 2 '/database/oradata/skyread/redo02.log' SIZE 512M,

10 GROUP 3 '/database/oradata/skyread/redo03.log' SIZE 512M,

11 GROUP 4 '/database/oradata/skyread/redo04.log' SIZE 512M,

12 GROUP 5 '/database/oradata/skyread/redo05.log' SIZE 512M

13 DATAFILE

14 '/database/oradata/skyread/system01.dbf',

15 '/database/oradata/skyread/tbs_test.dbf',

16 '/database/oradata/skyread/sysaux01.dbf',

17 '/database/oradata/skyread/users01.dbf',

18 '/database/oradata/skyread/system02.dbf',

19 '/database2/oradata/skyread/undotbs02.dbf',

20 '/database2/oradata/skyread/TBS_MRPMUSIC01.dbf',

21 '/database/oradata/skyread/sf01.dbf'

22 CHARACTER SET UTF8;

CREATE CONTROLFILE REUSE DATABASE "SKYREAD" NORESETLOGS FORCE LOGGING ARCHIVELOG

*

ERROR at line 1:

ORA-01503: CREATE CONTROLFILE failed

ORA-01565: error in identifying file '/database/oradata/skyread/redo04.log'

ORA-27046: file size is not a multiple of logical block size

Additional information: 1

SQL> CREATE CONTROLFILE REUSE DATABASE "SKYREAD" RESETLOGS FORCE LOGGING ARCHIVELOG

2 MAXLOGFILES 20

3 MAXLOGMEMBERS 5

4 MAXDATAFILES 1000

5 MAXINSTANCES 8

6 MAXLOGHISTORY 2337

7 LOGFILE

8 GROUP 1 '/database/oradata/skyread/redo01.log' SIZE 512M,

9 GROUP 2 '/database/oradata/skyread/redo02.log' SIZE 512M,

10 GROUP 3 '/database/oradata/skyread/redo03.log' SIZE 512M,

11 GROUP 4 '/database/oradata/skyread/redo04.log' SIZE 512M,

12 GROUP 5 '/database/oradata/skyread/redo05.log' SIZE 512M

13 DATAFILE

14 '/database/oradata/skyread/system01.dbf',

15 '/database/oradata/skyread/tbs_test.dbf',

16 '/database/oradata/skyread/sysaux01.dbf',

17 '/database/oradata/skyread/users01.dbf',

18 '/database/oradata/skyread/system02.dbf',

19 '/database2/oradata/skyread/undotbs02.dbf',

20 '/database2/oradata/skyread/TBS_MRPMUSIC01.dbf',

21 '/database/oradata/skyread/sf01.dbf'

22 CHARACTER SET UTF8;

Control file created.

下面是一系列的打开过程，由于redo04.log是活动的，所以需要恢复

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01589: must use RESETLOGS or NORESETLOGS option for database open

SQL> alter database open resetlogs;

alter database open resetlogs

*

ERROR at line 1:

ORA-01194: file 1 needs more recovery to be consistent

ORA-01110: data file 1: '/database/oradata/skyread/system01.dbf'

SQL> recover database;

ORA-00283: recovery session canceled due to errors

ORA-01610: recovery using the BACKUP CONTROLFILE option must be done

SQL> recover database using backup controlfile;

ORA-00279: change 122695861946 generated at 06/04/2013 13:48:31 needed for thread 1

ORA-00289: suggestion : /database/oradata/arch/1_34_815416841.dbf

ORA-00280: change 122695861946 for thread 1 is in sequence #34

Specify log: {=suggested | filename | AUTO | CANCEL}

/database/oradata/arch/1_34_815416841.dbf

ORA-00308: cannot open archived log '/database/oradata/arch/1_34_815416841.dbf'

ORA-27037: unable to obtain file status

Linux-x86_64 Error: 2: No such file or directory

Additional information: 3

应用日志并打开数据库：

Specify log: {=suggested | filename | AUTO | CANCEL}

/database/oradata/skyread/redo05.log

Log applied.

Media recovery complete.

SQL> alter database open resetlogs;

Database altered.

如果是未归档的活动在线日志文件损坏，那么需要有数据文件的备份才能恢复，这里不再详细介绍。