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。
To improve performance, federation frequently USES caching, materialized query tables (MQTs), and distributed query optimization and execution.
要改进性能，联合需要经常使用缓存、物理查询表(MQT)以及分布式查询优化和执行。
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。
In the distributed query optimization, both local processing cost and transmission cost should be thought over simultaneously.
在分布式查询优化中，应同时考虑本地处理代价和传输代价。
The only way for a remote server to enlist in the transaction is to be the target of a distributed query or a remote stored procedure call.
远程服务器登记到事务中的唯一方法是成为分布式查询或远程存储过程调用的目标。
So most research of distributed query optimization aim at reducing communication cost.
所以大多数研究分布式查询优化以减少通讯开销为目标。
This paper designed and realized a distributed database system of the urban electromagnetic environment and the distributed query processor in the system.
本文设计和实现了一个分布式的城市电磁环境数据库系统以及系统中的分布式查询处理模块。
Suppose you had access to such primitives; your goal in this project would be to explore how to use them to make distributed query processing more efficient.
假设可以取得此类原始工具，专题的目标是研究如何运用它们让分布型查询处理更加有效。
When adding distributed data into the database system, distributed query process is more difficult and complicated. The cost of query process is different due to different query process tactics.
在分布式数据库系统中，由于数据的物理分布使得分布式查询处理增加了许多新的复杂性，不同的查询处理策略，其查询处理代价和复杂度是大不一样的。
When adding distributed data into the database system, distributed query process is more difficult and complicated. The cost of query process is different due to different query process tactics.
在分布式数据库系统中，由于数据的物理分布使得分布式查询处理增加了许多新的复杂性，不同的查询处理策略，其查询处理代价和复杂度是大不一样的。
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