摘要： 自60年代至80年代,集中式系统及封闭型分布式系统已日趋成熟,数据库领域的研究方向将逐步转向开放型分布式系统。本文所涉及的联邦结构即为符合开放型特征的理想范例。该结构将在维持局部自治的前提下,对异构的局部系统进行集成,以提供数据部分及控制性共享。

关键词: 异构, 自治, 联邦, 多级协调, 动态串行, 事务补偿

Abstract: To provide each application with a transparent custom view of the data is an important goal of database design. The presence of multiple DBSs will make this goal more difficult, especially in heterogeneous environments, in which each local DBS has imcompatible hardware, system software, communication protocals, and DBMS itself.