【作者】 董群峰； 岳丽华； 朱丽娟；

【机构】 中国科学技术大学；

【摘要】 <正>一、系统模型现实中的分布式应用系统通常是由一台服务器或若干台服务器组成的服务器机群同时为很多用户提供服务。对于用户而言,他们只需关心与自己有关的通信代价,而服务器机群内部的通信代价则与用户无关,因此,我们可以把服务器或机群抽象为一台服务器SC。用户通信代价也就可以看成是某一个用户计算机MC的通信代价而进行考察。更多还原

【Abstract】 The communication cost a user have to pay to access his(her) data is an important measure by which we evaluate the performance of a Distributed Database Management System(DDBMS).It is of significant value to reduce users’communication cost to the lowest possible degree,especially in the mobile communication environment that is becoming more and more prevailing.Scientists have discovered, users’ communication cost can be effectively reduced by employing some more flexible data distribution algorithms for users’ data.In this paper,some accepted algorithms are introduced,and a new algorithm is suggested together with further theoretical proof and experimental analysis.更多还原