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: {
/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: {
/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。