移动数据库广播的并发控制算法研究

在基于数据广播的移动信息服务中,由于更新数据和广播数据两个过程是并发执行的,所以移动客户将面临接收数据不一致性问题。为此,该文提出了一种基于规则的并发控制算法来解决以上问题。在允许同步更新的情况下采用事件-条件-操作规则来进行无冲突的数据广播。该算法对移动机和数据库服务器的影响很小,同时又为基于广播的移动计算提供了数据一致性服务。

Research of Concurrent Control in Mobile Database Broadcasts

The broadcast -based data dissemination in wireless environment poses new challenging issues on data consistency of transaction processing.Due to concurrent execution of update transactions and broadcast of data items ,mobile transactions generated by mobile clients may observe inconsistency of data values.In this paper,we propose a mobile database system that uses a broadcast consistent algorithm utilizing rule-based approach for concurrency control among mobile and update transactions in the broadcast environment.We use Event-Condition-Action(ECA)rules to make decisions on broadcasting without conflicting.The system discussed in this paper,provides site autonomy between the mobile clients and the server with minimum upstream communication and data consistency that are desirable features to the scalability of applications which are running in broadcast environments.