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A Concurrency Control Method using Data Group Information in Mobile Computing Environments  

Kim, Dae-In (전남대학교 전자컴퓨터정보통신공학부)
Hwang, Bu-Hyun (전남대학교 전산학과)
Publication Information
Journal of KIISE:Databases / v.32, no.3, 2005 , pp. 315-325 More about this Journal
Abstract
In mobile computing environments, a mobile host caches the data items to use the bandwidth efficiently and improve the response time of transactions. If the data items cached in mobile host are updated in the server, the server broadcasts an invalidation report for maintaining the cache consistency of mobile hosts. However, this method has a problem that the response time of mobile transactions can be long since their commit decision is delayed until receiving the invalidation report from the server In this paper, we propose the USR-MT method for improving the response time of mobile transactions. As the UGR-MT method can make a commit decision by using the data group information before receiving the invalidation report, the response time of mobile transactions can be improved. Also our method can improve the cache's efficiency since it prevents all the contents of a cache from being invalidated in the case that the disconnection of a mobile host is longer than the broadcast period of invalidation report.
Keywords
Mobile Computing; Cache; Concurrency Control; Invalidation report; Data Group;
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