ORA-16177: media recovery is not required
Cause: The THROUGH LAST SWITCHOVER clause of the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE was specified and the database has been recovered to the most recent End-Of-Redo marker. All known archived logs have been applied. Managed recovery is not required.
Action: No action is necessary. The standby database may be activated as a new primary or may continue as a standby.