%0 Journal Article
%T Real-time Transaction Processing in a Mobile Environment<br>移动环境下实时事务处理
%A LI Guo-Hui YANG Jin-Cai WANG Hong-Ya
%A <br>李国徽
%A 杨进才
%A 王洪亚
%J 计算机科学
%D 2003
%I 
%X With the advances in mobile computing technology .there is an increasing demand for processing real-time transactions in a mobile environment. This paper proposes a multi-version data model. Based on this data model, we present a relative timing correctness criterion for real-time transactions in a mobile environment. As long as the data staleness is in a controlled extent, it is unnecessary for all the accessed data are valid when a real-time transaction commits. Also this paper gives a transaction execution model based on the image transaction concept. All these strategies not only decreas the cost for the transaction concurrency control,but also increase the possibility to meet mobile real-time transactions'deadlines by sacrificing the relatively transaction timing correctness. This is in accordance with the real-time transaction property that a relatively correct and in-time result is more preferable than an absolutely correct but obsolete result.
%K Mobile real-time database
%K Mobile real-time transaction
%K Data validity interval
%K Absolute timing correctness
%K Relative timing correctness<br>实时事务处理
%K 实时数据库
%K 移动环境
%K 教据库维护系统
%K 数据项
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=64A12D73428C8B8DBFB978D04DFEB3C1&aid=EC2B7F1D10DF4E20&yid=D43C4A19B2EE3C0A&vid=340AC2BF8E7AB4FD&iid=94C357A881DFC066&sid=9CF7A0430CBB2DFD&eid=708DD6B15D2464E8&journal_id=1002-137X&journal_name=计算机科学&referenced_num=0&reference_num=4