WebSphere Federation Server使用它的基于成本的优化器，确定检索和处理数据的最佳路径。
WebSphere Federation Server USES its cost based optimizer in order to determine the optimal access path to retrieve and process the data.
最后，我们还需要确定整体数据访问策略——先检索什么数据，如何在每个源上过滤数据等。
And finally, we needed to determine our overall data access strategy — which data to retrieve first, how we would filter data at each source, etc.
组织信息的目的是为了快速确定和检索有用的数据。
The purpose of organizing information is to allow rapid identification and retrieval of useful data.
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