每当数据库的模式发生更改，或者进行像添加或删除数据文件、添加或删除表空间这样的更改时，建议管理员执行脱机备份。
Administrators are advised to do an offline backup whenever the schema of the database changes, or changes are made such as adding or removing data files, and adding or removing of table Spaces.
初始化为镜像的分割镜像可以用作系统级备份，从而使管理员可以执行快速的文件系统级数据库恢复。
A split mirror initialized as mirror can be used as a system level backup, allowing the administrator to perform a quick file system level recovery of the database.
在许多情况下，这类备份将是足够的，并且为管理员提供了极大的控制能力。
In many cases, this type of backup will be adequate, and it provides a great deal of control for the administrator.
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