The ultimate aim of asynchrony is to reduce the execution time of the federated query.
异步的最终目的是减少联邦查询的执行时间。
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。
Aim at these shortcomings, we discuss the application of storing persistence object through a concrete information system instance. JDO technology can store or query database in transparent way.
针对这些缺点我们通过一个具体的信息系统应用实例分析了JDO技术在实际永久性对象技术存储的应用，JDO技术可以用透明的方式保存数据库或在数据库中访问。
Query optimization aim is to find the most efficient solution among many feasible query plans.
查询优化就是从这些策略中找出最有效查询计划的一种过程。
Query optimization aim is to find the most efficient solution among many feasible query plans.
查询优化就是从这些策略中找出最有效查询计划的一种过程。
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