Study And Application Of Distributed Database System

This paper studies about the theory design and realization technic of distributed database system,and realizes a database application system based on client server model.Distributed database system caters to the need for information system application,is adapted to the managing method of today's groups. The paper is mainly about the querying optimizing,the directory management and the synchronization control.Because distributed database system is not the simple combination of internet and database system,it is difficult to realize and there is not real distributed database system for commercial use now. But,under the great need for information share,application based client server model that is easier to realize comparatively. Client server system deals with data service and normal affairs on two computers,and realize data share.By the realization progress of ShiDa CATV(Community antenna television) addressable managing system,the paper studies about the database application based on client server model. In ShiDa system,new technics is used to realize uses management. Dynamic coding is realized and tree shaped directory is used to manage uses. Dynamic coding lets TV stations decide their coding setting especially according to their own condition including the amount of their users and region condition. By showing the users' code information as tree shaped directory,tree shaped directory technic gets the operation more easily,more quickly and more exactly.