In addition to managing the federation, the federated server is also a full-function relational database with the capability to store and manage local data.

除了管理联邦以外，联邦服务器还是一个功能完整的关系数据库，具有存储和管理本地数据的能力。

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Set Manipulation: Instead of simply retrieving specific records and returning them to the application, a relational-type database has the capability to manipulate the data.

集合操作：不是简单地检索特定记录并返回给应用程序，关系型数据库具有操作数据的功能。

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To leverage that capability, JPA can defer assignment of an entity's ID attribute to the relational database.

为了权衡使用这项功能，JPA 可以延缓向关系数据库分配实体的 ID。

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