DB 2 UD b数据库的分割镜像可以被初始化为一个热备用数据库，当主数据库不可用时，可提供一个快速的灾难恢复选项。
A split mirror of a DB2 UDB database can also be initialized as a warm standby database, providing a quick disaster recovery option if the primary database becomes unavailable.
也就是说，他们提供了一个初始主查询，该查询可以保证搜索系统至少能够访问他们感兴趣的区域中的一些文档。
That is, they issue an initial broad query that reassures them that the search system gives access to at least some documents in the area they are interested in.
因为所有的辅助构造函数最终都会调用主构造函数，它主体中进行的逻辑检查和其它初始化工作会在所有实例被创建的时候执行。
Because all auxiliary constructors eventually invoke the primary constructor, logic checks and other initializations done in the body will be performed consistently for all instances created.
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