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Dataguard Switch Over Steps In Case of Disaster.



Dataguard Switch Over Steps In Case of Disaster

1. Cancel the Archivelog Apply:

alter database recover managed standby database cancel;

2. Check whether any gap exists between archivelogs:

SELECT THREAD#, LOW_SEQUENCE#, HIGH_SEQUENCE# FROM V$ARCHIVE_GAP;

3. If gap exists OS copy the archive files to standby and then issue this command. In my case I had 4 archivelogs not reaching to standby.

ALTER DATABASE REGISTER PHYSICAL LOGFILE  '/RECOVERY_DESTINATION/STAN/archivelog/2012_02_07/o1_mf_1_15_7m1w964b_.arc';

ALTER DATABASE REGISTER PHYSICAL LOGFILE  ‘/RECOVERY_DESTINATION/STAN/archivelog/2012_02_07/o1_mf_1_16_7m1wdr56_.arc’;

ALTER DATABASE REGISTER PHYSICAL LOGFILE  '/RECOVERY_DESTINATION/STAN/archivelog/2012_02_07/o1_mf_1_17_7m1wg7wp_.arc’;

ALTER DATABASE REGISTER PHYSICAL LOGFILE  '/RECOVERY_DESTINATION/STAN/archivelog/2012_02_07/o1_mf_1_18_7m1wrrmz_.arc’;


4. ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH FORCE;


5. Switching the standby to Primary. 
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;

6. ALTER DATABASE OPEN;
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Happy to Help !!!
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