ORA-16659: failover operation in progress

Cause: A primary database that restarted contacted a standby database that is being failed over to.

Action: Shutdown the primary database and wait for failover to complete on the standby database. Once failover is complete, restart the old primary database. If the failover occurred due to Fast-Start Failover, restarting the primary database after failover is complete will allow it to be automatically reinstated as a standby database to the new primary database.

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