离线策略应用到用于备份和恢复数据库映像的机器。
An offline policy is applied to a machine that is used for backing up and restoring database images.
如果出现站点范围内的故障，则存活的站点总是有一个可镜像的、准确的数据库映像。
If a site-wide failure occurs, the surviving site always has a mirrored, accurate image of the database.
因为DB 2 II为远程数据源提供了一个虚拟的数据库映像，所以我们不需要为每个这样的活动编写代码。
Because DB2 II presents a virtual database image of remote data sources, we didn't need to write code for each of these activities.
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