移动实时数据库的时间一致性研究  

Study on Time Consistency of Mobile Real-time Database

作　　者：许亚梅[1] 张立臣[2] 

机构地区：[1]广东工程职业技术学院,广东广州510520 [2]广东工业大学,广东广州510090

出　　处：《现代电子技术》2009年第16期76-79,共4页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(90818008;60774095);广东省自然科学基金资助项目(07001774)

摘　　要：在实际应用中,实时的移动数据库系统不仅需要确保事务完成的最后期限,而且还需保证事务处理的时态一致性,为此研究了移动实时数据库的时间一致性。从移动实时数据库时间特性的定义出发,分析实时事务的时间一致性限制因素,提出实时事务的时间一致性维护策略。性能测试结果表明,乐观协议OPT-Wait与基于锁的协议VL-HP各有优劣,在延误截止时间率方面,OPT-Wait协议比VL-HP协议性能好。In practice, the mobile real- time database system is required to ensure not only the deadline of transaction, but also tense consistency of transaction. Therefore, the time consistency of mobile real - time database is studied. From the definition of time characteristics of mobile real- time database, constraints of time consistency of real- time transaction are ana- lysed, maintenance strategy of time consistency of real - time transaction is proposed. Performance test results show that OPT - Wait protocol and the VL - HP protocol based on the lock have their own advantages and disadvantages. In the rate of the deadline delaying,OPT- Wait protocol is better than VL- HP VL- HP protocol.

关 键 词：移动实时数据库 时间特性 时间一致性 截止时间 并发控制协议 

分 类 号：TP311.133[自动化与计算机技术—计算机软件与理论]