只有当应用程序启动时，资源适配器才能验证类似于主机名称和端口号这样的属性是否正确。
Only when the application starts can the resource adapter verify whether properties such as host names and port Numbers are correct.
当发生故障的成员主机返回时，应用程序会被透明地路由到重新启动的成员。
When the failed member host returns, applications will be transparently routed to the restarted member.
为了访问在DR站点上重新启动的应用程序，只需修改DNS中的别名，让它们指向DR站点上新的RG主机名。
To provide access to the applications now restarted at the DR site, the only change that is necessary is to re-point the alias names in the DNS to the new RG host name in the DR site.
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