Because many programmers have existing data that does not reside in DB2 UDB databases, IBM offers both transparent access to this data with federation capabilities.

因为许多程序员拥有的数据并不在DB 2 UDB数据库中，IBM通过联邦功能提供了对这些数据的透明访问。

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Implementations of the data federation pattern vary in their capabilities which specific source models they can integrate.

数据联合模式的实现在其可以集成的具体源模型的能力方面各有不同。

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Understanding the capabilities of the data source enables the federation server to push down more functionality to that data source, which generally improves performance.

理解数据源的能力之后，联邦服务器就可以将更多的功能下推到那个数据源，这通常可以提高性能。

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