Oracle : Ошибка ORA-16138

"end of log stream not received from primary"
*Cause: The standby system has not received notification that the primary
system log stream has been terminated. A graceful switchover is not
*Action: Verify that the primary log stream has been terminated. Ensure that
the standby has applied all necessary redo from the primary system
and, if appropriate, reissue the graceful switchover command.

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