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 '/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-2