oracle日志文件和控制文件损坏的恢复

恢复步骤：

1.加入_allow_resetlogs_corruption=true，_corrupted_rollback_segments=true，_offline_rollback_segments=true，启动到nomount

2.利用控制文件的备份，进行脚本重建，由于current状态redo损坏，所以要resetlogs重建

3.重建后通过alter database open resetlogs;打开数据库，这种情况会丢失在redo中相关事务的数据

备份控制文件并模拟故障：

SQL> set linesize 150

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

Database altered.

SQL> insert into tb1 values (1);

1 row created.

SQL> COMMIT;

Commit complete.

SQL> select * from v$log;

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

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

1 1 1 536870912 1 YES INACTIVE 1.2269E+11 2013-05-03 16:08:03

2 1 2 536870912 1 YES INACTIVE 1.2269E+11 2013-05-03 16:23:48

3 1 3 536870912 1 NO CURRENT 1.2269E+11 2013-05-11 07:26:45

4 1 0 536870912 1 YES UNUSED 0

5 1 0 536870912 1 YES UNUSED 0

SQL> shutdown abort;

oracle@readerlogdb-> rm -f redo03.log

oracle@readerlogdb-> rm -f control01.ctl control02.ctl control03.ctl

通过加入相关参数启动到nomount状态：

SQL> conn /as sysdba

Connected to an idle instance.

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

SQL> create pfile='/home/oracle/pfile.ora' from spfile;

在备份的pfile中加入以下三行：

*._allow_resetlogs_corruption=true

*._corrupted_rollback_segments=true

*._offline_rollback_segments=true

NORESETLOGS和RESETLOGS在此实验中的区别：

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

MAXLOGFILES 20

MAXLOGMEMBERS 5

MAXDATAFILES 1000

MAXINSTANCES 8

MAXLOGHISTORY 2337

LOGFILE

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

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

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

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

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

DATAFILE

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

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

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

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

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

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

'/database2/oradata/skyread/undotbs02'

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/redo03.log'

ORA-27037: unable to obtain file status

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

Additional information: 3

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