Oracle : Ошибка ORA-01648

"log %s is the current log of disabled instance %s (thread %s)"
*Cause: An attempt to enable the thread failed after it was half completed.
This log was left as the current log even though the thread is still
disabled. Since a log switch cannot be done until the thread is
enabled, the log can not be cleared or archived.
*Action:Complete the thread enable by issuing the enable command again.

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