ORA-16574: switchover disallowed when required

admin

ORA-16574: switchoverdisallowed when required databases are shut down
Cause: Switchover failed because either the primary databaseor the designated
standby database were shut down.
Action: Ensurethat the primary and standby databases are running and that
primary database is shipping redo data to the designated standby database. Also
ensure that that the designated standby database is applying the redo data
received from the primary database.