ORA-16651: requirements not met for enabling Fast-Start Failover

Cause: The attempt to enable Fast-Start Failover could not be completed because one or more requirements have not been met:

- The Data Guard configuration must be in MaxAvailability protection mode.

- The LogXptMode property for both the primary database and the Fast-Start Failover target standby database must be SYNC.

- The primary database and the Fast-Start Failover target standby database must both have flashback enabled.

- No valid target standby database was specified in the primary database's FastStartFailoverTarget property prior to the attempt to enable Fast-Start Failover, and more than one standby database exists in the Data Guard configuration.

Action: Retry the attempted command after correcting the issue:

- Set the Data Guard configuration to MaxAvailability protection mode.

- Ensure that the LogXptMode property for both the primary database and the Fast-Start Failover target standby database are SYNC.

- Ensure that both the primary database and the Fast-Start Failover target standby database have flashback enabled.

- Set the primary database's FastStartFailoverTarget property to the db_unique_name value of the desired target standby database add the desired target standby database's FastStartFailoverTarget property to the db_unique_name value of the primary database.

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