Redo logfile recover

ORACLE_FileManage_Redo logfile recover

1). No-current and active status about the redo was destroyed

The issue:

The redo log was dropped, now mounted, but can’topen and show warning:

       ORA-00313:open failed for members of log group 3 of thread 1

       ORA-00312: online log 3thread 1: '/oracle10/oradata/ora10g/redo03.log'

The solution:

SQL>selectgroup#,thread#,sequence#, archived,status from v$log;

       GROUP# THREAD#  SEQUENCE#  ARCHIVED STATUS 

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

       1                1                103                  YES      INACTIVE

       2                1                104                  NO       CURRENT

       3                1                102                  YES      INACTIVE

If thisredo logfinished the archive, we can to do this:

SQL> Alter database clear logfile group 3;

If still didn’tarchive, we have to do this:

SQL> Alter database clear unarchived logfile group 3;

And then try to open:

SQL> Alter database open;

Suggest to do the full backup ASAP.

 

2). currentor active status about the redo was destroyed

The issue:

       ORA-00313:open failed for members of log group 2 of thread 1

       ORA-00312: online log 2thread 1: '/oracle10/oradata/ora10g/redo02.log'

The solution:

SQL>selectgroup#,thread#,sequence#, archived,status from v$log;

       GROUP# THREAD#  SEQUENCE#  ARCHIVED STATUS 

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

       1                1                2                  YES      INACTIVE

       2                1                4                  NO       CURRENT

       3                1                3                  YES      INACTIVE

 

Scene 1: This redostill here, just belong to the logic corrupted, and didn’t any events need torecover

SQL> alter database clear unarchived logfile group 2;     <====== Not any warning.

SQL> recover database until cancel;

SQL> alter database open resetlogs;

Scene 2: The redo wasdestroyed, and need to recover. But there are some history backup and thearchivelog files.

SQL> alter database clear unarchived logfilegroup 2;  <=== Will get some warning

ERROR at line 1:

ORA-01624: log 1 needed for crash recovery ofthread 1

-- restore database;

SQL> recover database until cancel;     <==== Choose “auto”

SQL> alter database open resetlogs;

Need to finish a full backup ASAP.

Scene 2: The redo wasdestroyed, and need to recover, no any history backup

SQL> shutdown immediate;

And add the following in the pfile:

*._allow_resetlogs_corruption=true              #<===== Suggest to backup the datafile, this database can't rollback after add some unpublished parameters.

SQL> startup mount pfile=‘xxx’;

SQL> recover database until cancel;

SQL>alter database open resetlogs;

SQL> shutdown immediate;

SQL>Startup;

Need to rebuild this database after exp theapplication data.