This paper introduces the meth ods how to realize the shared data and preserve the unification of date, discuss es the advantage and shortcoming of each method, and gives the method of shared date in DDB system.

• 本文介绍了ORACLE分布式数据库系统中实现数据共享，维护数据一致性的几种方法及每种方法的优缺点，解决了此种系统中数据共享的问题。