ORA-00350：log string of instance string (thread string) needs to be archived
错误码
错误描述：log string of instance string (thread string) needs to be archived
错误原因：The command cannot be done because the log has not been archived, and media recovery has been enabled.
解决方法：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 files.
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