移动数据库缓存同步更新机制

Synchronous Data Update Mechanism of Mobile Database Based on Cache

移动数据库中缓存是服务器数据的一个副本,它能够有效的提高本地事务处理速度和缓解服务器端事务处理压力,尤其在网络频繁断接或低带宽的条件下更能体现出其重要性。缓存数据在与服务器数据同步的过程中,需要不断的下载更新数据以满足事务操作。通过分析热点数据和高优先级数据具有提高事务处理效率等方面优点,设计一种减少无线传输量且达到较好系统性能的缓存同步更新机制。

Data caching in mobile database is a data replica of database server,which can effectively increase the speed of local transaction processing and relieve the pressure of database server.This is especially crucial in mobile databases because of the limited bandwidth and slower communication speed of wireless channels.In the process of synchronous data updating,data cache need to download the appropriate data in order to satisfy the require of transaction process.Through the analysis of the advantage of hot data and the high priority data,the paper design a synchronous data caching update mechanism which can reduce the throughput of transmission and get better performance.