关键词: 移动数据库, 移动计算环境, 自适应缓存管理, 位置服务, 断接

Abstract: Aiming at the mobile computing environment, concept of self-adaptive cache management of mobile database is presented and a good concept model is proposed for it. Flex group bit vector compression method is proposed to resolve location based service in mobile environment and active abort type combining with mechanism of notification acknowledgement is proposed to resolve the frequent disconnection in mobile environment. The specification of the scheduling algorithm is also presented in detail. The feasibility and availability have been proved by running the policy on designed mobile online doctor reservation system. The results of the practical use show that self-adaptive database cache management can dramatically shorten the system response time and reduce spending of system resources, and is of better performance in supporting location based service and the frequent disconnecting in mobile environment, thus effectively improves the whole performance of mobile application.

Key words: mobile database, mobile computing environment, self-adaptive cache management, location based service, disconnection