Advances in communication technology and inexpensive hardware are spreading the use of distributed information systems and in particular distributed databases. There has also been a lot of interest and substantial investment in the use of personal computers. This has led to the development of microcomputer based database management systems (DBMS). These DBMS's differ in their underlying data models and their data definition, manipulation and security capabilities. As part of the development of an Office Information System a need was felt to integrate the available microcomputers and their databases. This paper provides an overview of our approach to integrate these heterogeneous microcomputer based database management systems. The innovative features incorporated in the design include: To support the existence of overlapping (non-disjoint) data fragments at different nodes leading to very flexible data distribution options and thus improving locality of reference and efficiency ofquery processing. To support the existing data models and applications; our system acts as a front-end to the existing local DBMS. To exploit LAN capabilities for query optimization.
通信技术和廉价硬件的进步正在扩展分布式信息系统，尤其是分布式数据库的使用。在使用个人计算机方面也引起了很多兴趣和大量投资。这导致了基于微计算机的数据库管理系统（DBMS）的发展。这些DBMS的基础数据模型以及数据定义，操作和安全性功能有所不同。作为办公信息系统开发的一部分，人们感到需要集成可用的微型计算机及其数据库。本文概述了我们将这些基于异构微机的数据库管理系统进行集成的方法。设计中包含的创新功能包括： 要支持在不同节点上存在重叠（不相交）的数据片段，从而导致非常灵活的数据分发选项，从而提高引用的局部性和查询处理的效率。 支持现有的数据模型和应用程序;我们的系统充当现有本地DBMS的前端。 利用LAN功能进行查询优化。
