移动数据库中基于代理的事务执行策略

移动计算环境中,移动设备在断连状态下对数据进行操作是必要的。为了支持断连操作,需要在移动客户端上进行数据缓存;另一方面,在重新连接后,移动客户端上的暂时事务需要在服务器上重新执行,这使得事务的一致性很难得到保障。扩展嵌套事务的概念并提出了一种策略,通过在事务执行机制中加入移动代理,在频繁断连状态下,使事务执行时数据的一致性能满足应用要求。根据对事务执行策略的模拟和测试,表明基于代理的事务执行是可行的和正确的,为移动环境中的数据同步提供了一种新方法。

A New Strategy for the Agent-Based Transaction Processing in Mobile Database System

In the mobile computing environment, the disconnected operation on mobile clients is necessary. For the support of the disconnection operation, mobile clients need cache data from the server. After reconnecting, the temporary transaction reprocesses on the server, but the consistency of data cannot be guaranteed. In this paper, based on the concept of nest transaction, we discuss a new strategy to handle the operation in a mobile computing environment. By using agents in the transaction processing, the demand of data consistency could be satisfied.