ORA-16636: Fast-Start Failover target standby in error state, cannot stop observer

Cause: A STOP OBSERVER operation could not be completed when Fast-Start Failover was enabled because the target standby database could not participate in the STOP OBSERVER operation.

Action: Additional information about this failure is recorded in the Data Guard broker log file for the primary database. This information helps you identify the reason why the target standby database was unable to participate in the STOP OBSERVER operation. You may correct the problem that is indicated by that information and retry the operation. Alternatively, you may forcibly disable Fast-Start Failover while connected to the primary database using the DISABLE FAST_START FAILOVER FORCE command in the DGMGRL CLI. You can then stop the observer regardless of the current state of the target standby database.

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