With a federated system, you can use a single SQL statement to send distributed requests to multiple data sources.
有了联邦系统，便可以使用一条SQL语句将分布式请求发送到多个数据源。
Users of a federated database system can pose distributed queries over data stored anywhere in the federated system, regardless of its location or the SQL dialect of the data source.
联邦数据库系统的用户可以对存储在联邦系统中任意位置的数据进行分布式查询，不管自己的位置在哪里，也不管数据源使用的是哪种SQL方言。
Provides helpful hints and tips on how to tune the performance of a distributed query in a federated system.
提供关于如何调优联邦系统中一个分布式查询的性能的提示和技巧。
The performance of the federated system is comparable to the performance of some existing user-written application program that implements the same distributed query
联邦系统的性能是否与一些已有的用户编写的实现相同分布式查询的应用程序的性能相当。
Before we describe the different types of queries and operations that you can perform on your federated system, we would like to first provide an overview of how a distributed query is processed.
在描述对联邦系统执行的不同类型的查询和操作之前，我们首先对分布式查询的处理过程作一个概述。
Before we describe the different types of queries and operations that you can perform on your federated system, we would like to first provide an overview of how a distributed query is processed.
在描述对联邦系统执行的不同类型的查询和操作之前，我们首先对分布式查询的处理过程作一个概述。
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