下一节提供了样本语句用于在容量和响应信息区域中进行常用的请求查询。
The next section provides sample statements for commonly requested queries in the area of volume and response information.
优化器使用表大小、索引可用性以及数据分布等信息来确定响应该查询的最佳路径。
The optimizer USES information such as table sizes, availability of indexes, and data distribution to figure out the optimal way to answer the query.
DNS是一个分布式服务，只要知道是谁在请求信息，就有多个服务器能够响应某个给定的查询。
DNS is a distributed service, in that more than one server is capable of responding to a given query, providing it knows who to ask for the information.
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