RMAN-06100：no channel to restore a backup or copy of datafile number
错误码
错误描述：no channel to restore a backup or copy of datafile number
错误原因：A data file, tablespace, or database restore could not proceed because the backup of the indicated file exists on a device type that was not allocated for restore.
解决方法：None - this is an informational message. See message 6026 for further details.
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