Oracle : Ошибка ORA-16217

"prepare to switchover has not completed"
*Cause: An ALTER DATABASE PREPARE TO SWITCHOVER command was issued, but
the prepare activity did not complete.
*Action: Verify that the standby was prepared properly. You may cancel
the prepare and perform an unprepared switchover which requires
a database link to complete. Or reissue the prepare operation
on the standby.

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