Oracle : Ошибка ORA-00350

"log %s of instance %s (thread %s) needs to be archived"
*Cause: The command cannot be done because the log has not been archived,
and media recovery has been enabled.
*Action: Archive the log or disable media recovery. If the command supports
an UNARCHIVED option then it can be used. However this may result
in making backups unuseable, and forcing the drop of some offline

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