HOW TO RECOVER REDOLOGS

If You have lost all your online redo logs. As a result, your database has crashed. You have

tried to restart the database and clear the online redo log files, but when you try to open the

database you get the following error.

SQL> startup

ORACLE instance started.

Total System Global Area 167395328 bytes

Fixed Size 1298612 bytes

Variable Size 142610252 bytes

Database Buffers 20971520 bytes

Redo Buffers 2514944 bytes

Database mounted.

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

ORA-00312: online log 2 thread 1: ‘/oracle01/oradata/orcl/redo02a.log’

ORA-27037: unable to obtain file status

Linux Error: 2: No such file or directory

Additional information: 3

ORA-00312: online log 2 thread 1: ‘/oracle01/oradata/orcl/redo02.log’

ORA-27037: unable to obtain file status

Linux Error: 2: No such file or directory

Additional information: 3

SQL> alter database clear logfile group 2;

alter database clear logfile group 2

*

ERROR at line 1:

ORA-01624: log 2 needed for crash recovery of instance orcl (thread 1)

ORA-00312: online log 2 thread 1: ‘/oracle01/oradata/orcl/redo02.log’

ORA-00312: online log 2 thread 1: ‘/oracle01/oradata/orcl/redo02a.log’

Steps for Recovery.

11)      Restore the last full database backup.

22)      Restore all archived redo logs generated during and after the last full database backup.

33)      Issue the Startup Mount command to mount the database.

44)      Perform a point-in-time recovery, applying all archived redo logs that are available.

55)      Open the database using the alter database open resetlogs command.