对于非关系对象、远程视图或别名，它通常会检索到没用的信息。
It generally retrieves no useful information for nicknames over nonrelational objects, remote views, or aliases.
在我们的例子中，这些指示器表示数据库对象(如别名或服务器)集的聚合状态。
They represent an aggregate state of a set of database objects, in our case, nicknames or servers.
此时，您可能正纳闷，为什么我还要讨论内存管理、别名和对象所有权。
At this point, you're probably wondering why I'm even talking about memory management, aliases, and object ownership.
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