oracle非归档模式下面的日志文件被意外的破坏的恢复方法

 

1，在非current状态下

如果我们直接删除物理的日志文件，会导致下次启动数据库的时候不能启动数据库，我们就只有删除这个group后在启动数据库就可以了。

SQL> select group#,member from v$logfile;

    GROUP# MEMBER

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

         3 /sof/oracle/oradata/orcl/redo03.log

         2 /sof/oracle/oradata/orcl/redo02.log

         1 /sof/oracle/oradata/orcl/redo01.log

         4 /sof/oracle/oradata/orcl/redo04.log

SQL> ho rm /sof/oracle/oradata/orcl/redo04.log

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area  188743680 bytes

Fixed Size                  1218460 bytes

Variable Size              67111012 bytes

Database Buffers          117440512 bytes

Redo Buffers                2973696 bytes

Database mounted.

ORA-00313: open failed for members of log group 4 of thread 1

ORA-00312: online log 4 thread 1: '/sof/oracle/oradata/orcl/redo04.log'

SQL> alter database drop logfile group 4

  2  ;

Database altered.

SQL> shutdown immediate;

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area  188743680 bytes

Fixed Size                  1218460 bytes

Variable Size              67111012 bytes

Database Buffers          117440512 bytes

Redo Buffers                2973696 bytes

Database mounted.

Database opened.

 

 

2.下面是删除current状态的日志文件。

SQL> select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

         1 INACTIVE

         2 CURRENT

         3 INACTIVE

SQL> select group#,member from v$logfile;

    GROUP#

----------

MEMBER

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

         3

/sof/oracle/oradata/orcl/redo03.log

         2

/sof/oracle/oradata/orcl/redo02.log

         1

/sof/oracle/oradata/orcl/redo01.log

SQL> ho rm /sof/oracle/oradata/orcl/redo02.log

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area  188743680 bytes

Fixed Size                  1218460 bytes

Variable Size              67111012 bytes

Database Buffers          117440512 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: '/sof/oracle/oradata/orcl/redo02.log'

介质恢复

SQL> recover database using backup controlfile;

ORA-00279: change 1131887 generated at 01/06/2010 01:52:36 needed for thread 1

ORA-00289: suggestion :

/sof/oracle/flash_recovery_area/ORCL/archivelog/2010_01_06/o1_mf_1_1_%u_.arc

ORA-00280: change 1131887 for thread 1 is in sequence #1

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

auto

ORA-00308: cannot open archived log

'/sof/oracle/flash_recovery_area/ORCL/archivelog/2010_01_06/o1_mf_1_1_%u_.arc'

ORA-27037: unable to obtain file status

Linux Error: 2: No such file or directory

Additional information: 3

ORA-00308: cannot open archived log

'/sof/oracle/flash_recovery_area/ORCL/archivelog/2010_01_06/o1_mf_1_1_%u_.arc'

ORA-27037: unable to obtain file status

Linux Error: 2: No such file or directory

Additional information: 3

修改这个参数是为了让数据库启动时不检查日志文件的一致性

SQL> alter system set "_allow_resetlogs_corruption"=true  scope=spfile;

System altered.

SQL> shutdowm immediate;

SP2-0734: unknown command beginning "shutdowm i..." - rest of line ignored.

SQL> shutdown immediate;

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

SQL> startup mount

ORACLE instance started.

Total System Global Area  188743680 bytes

Fixed Size                  1218460 bytes

Variable Size              67111012 bytes

Database Buffers          117440512 bytes

Redo Buffers                2973696 bytes

Database mounted.

这个命令是reset  log

SQL> alter database open resetlogs;

Database altered.

SQL> alter system reset "_allow_resetlogs_corruption"  scope=spfile sid='*';

System altered.

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area  188743680 bytes

Fixed Size                  1218460 bytes

Variable Size              67111012 bytes

Database Buffers          117440512 bytes

Redo Buffers                2973696 bytes

Database mounted.

Database opened.

SQL> select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

         1 CURRENT

         2 UNUSED

         3 UNUSED

SQL> select group#,member from v$logfile;

    GROUP#

----------

MEMBER

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

         3

/sof/oracle/oradata/orcl/redo03.log

         2

/sof/oracle/oradata/orcl/redo02.log

         1

/sof/oracle/oradata/orcl/redo01.log