RMAN-06481：warning
错误码
错误描述：warning
错误原因：The CHANGE BACKUPPIECE AVAILABLE command was used, but the backup piece cannot be found on the storage medium.
解决方法：If the storage containing the backup piece has been removed from the host, restore it and retry the command. If the backup piece is permanently gone, then issue the CHANGE BACKUPPIECE DELETE command for this backup piece.
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