如果任何关键dbspaces(比如根dbspace，这些dbspace包含逻辑日志或物理日志)出错，则必须执行冷还原。
A cold restore has to be done if any of the critical dbspaces (such as root dbspace, dbspaces containing the logical logs, or the physical log) is down.
为将一个文件备份还原到其原始位置，只需在根处键入以下命令即可
To restore a file backup to its original location, simply key in the following command from root
为还原到其他位置，从根处键入以下命令。
To restore to a different location, key in the following command from root.
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