【作者】 恽益群； 徐立臻； 张洁； 董逸生；

【机构】 东南大学计算机科学与工程系；

【摘要】 <正>1.引言移动计算环境由移动终端和固定网络共同组成。无线网络技术的迅速发展使得用户可以随时进行网络连接并且访问数据。移动终端一般是PDA,手机或者掌上电脑等。这种移动计算环境是基于传统的固定网络分布式计算环境的扩展,由于计算终端的移动性,网络连接的间断性,网络通信上行和下行链路的不对称性等问题,而使得移动环境下的数更多还原

【Abstract】 The mobile computing environment has brought new changes and new concepts of the database transaction management.Against computing terminals’ mobility,intermitted wireless connections and limitation of wireless resources,we have designed and developed a DBMS,called SEU-SWIFT,which not only supports disconnected transaction operations but supports online operations.We present a sketch of the three-tier architecture model to process mobile transactions and make detailed introduction to it.SEU-SWIFT manages mobile transactions with the help of the transaction log and uses two-direction replication techniques to keep the global data in consistency.The transaction model and the corresponding transaction managements we introduced can practically resolve the present industry_oriented requirements of mobile computing environments.更多还原