基于工作集的移动应用设计

Design of mobile application based on working-set

在移动数据库环境中,同时保证数据的移动性、可用性和一致性是非常困难的事情。提出了工作集管理器机制,该机制在固定网络上维护用户工作集的不同版本,用户可以根据对数据的需求以及当前的网络情况,指定对哪些数据进行监控,同时指定在什么条件下生成新的视图版本。通过对标准SQL语句进行扩充,使得用户在数据移动性、可用性和一致性之间取得一种平衡。

In the environment of mobile database,it is very difficult to ensure the mobility,availability and consistency of data at the same time. An architecture named working-set manager,which maintained multi-version of user's working-set on the fixed network was presented. Based on the condition of the network and the need of data for this application,user can point out the data to be monitored and when to generate the new version of the materialization view. By enlarging the statement of SQL,this architecture offered the user a tradeoff among the mobility,availability and consistency of data.