16659, 0000, "failover operation in progress"
*Cause: A primary database that restarted contacted a standby database
that is being failed over to.
*Action: Shut down 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 allows it to be automatically reinstated as a standby
database to the new primary database.