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Don Burleson Blog 







ORA-12514 on Data Guard Switchover 

Oracle Tips by Burleson Consulting

November 21, 2011

Question:  I have set-up a Primary 11g database which successfully ships and applies logs to a Single Standby (on the same server) as expected. Manual switchovers work fine; however, I cannot do switchovers with the Data Guard Broker utility.

The switchover is successful- but the broker cannot restart the Primary instance. The strange thing is that when I perform a switchover in the opposite direction (i.e. the new Primary goes back to standby again) it works fine. The error on switchover is:

ORA-12514: TNS: listener does not currently know of service requested in connect descriptor.

I can  manually start the failover instance, but how do I get my instance to re-start automatically after a switchover?

Answer:  The book "Oracle Data Guard" has working examples of Data Guard switchover/failover in the code depot download:
Also see my notes on the ORA-12514 error ORA-12514 TNS_listener_does_not_currently_know_service_requested
Here are some issues with the ORA-12514 during Data Guard failover.  First, run these Data Guard broker commands to see the status of the standby instance:

DGMGRL> show database verbose ‘mystandbysid’;
DGMGRL> switchover to 'mystandbysid';

Some DBA's suggest that this startup error may be because the special service db_unique_name_DGMGRL has not been registered properly with the listener.
If you want to enable DGMGRL to automatically re-start a standby database instance, you list create a listener service and register the service with the local listener on both the primary and failover/standby instance.
The value GLOBAL_DBNAME should be a concatenation of the db_name and the domain name: e. g. db_unique_name_DGMGRL.db_domain.
For example:
      ADDRESS=(PROTOCOL=tcp)(HOST=host_name) (PORT=port_num)



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