分布式数据查询技术的实现与分析

Implementation and Analysis of Distributed Data Query Technique

分布式数据库系统的数据在逻辑上是统一的,而在物理上却是分散的.分布式查询可以访问来自多种异类数据源的数据,而这些数据可存储在相同的或不同的计算机上,与集中式数据库相比它有诸多优点,但也有很多新问题,如:数据一致性问题、数据远程传递的实现、通信开销的降低等.本文具体分析解决了远程对象的发布与获取、数据库的访问、分布式查询等方面的关键问题,对实现分布式数据查询的技术进行初步探讨和分析.

The data of distributed data system is identical logically, and dispersed physically. And this system may access data from various sources, which are stored in the same or different computer. Compared with the centralized system, it has its advantages, but there also exist some new problems, such as data consistency, distant transmission, and telecommunication spending and so on. The article analyzes on the distribution and acquirement of distant object, data query, distributed data query, and touches on the advancement of distributed data query.