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A Consistency Control of Method for Spatial Data Cached in Mobile Clients  

안경환 (부산대학교 컴퓨터공학과)
차지태 (부산대학교 컴퓨터공학)
홍봉희 (부산대학교 컴퓨터공학과)
Publication Information
Journal of KIISE:Databases / v.31, no.3, 2004 , pp. 274-286 More about this Journal
Abstract
In mobile client-server environments, mobile clients usually are disconnected with their server because of high cost of wireless communication and keep their own local copies to provide efficient updating the cached map. The update of the server database leads to invalidation of the cached map in the client side. To solve the issues of invalidation of the cached map, it is not efficient to resend part of the updated server database to clients whenever the updating of the server database occurs. This paper proposes a log-based update propagation method to propagate the server's update into its relevant clients by using only update logs. Too many logs increasingly accumulate as the sever database is updated several times. The sequential search of the relevant log data for a specific client is time-consuming. Sending of unnecessary logs should be avoided for reducing the overhead of communication.'re solve these problems, we first define unnecessary logs and then suggest log reduction methods to avoid or cancel creating unnecessary logs. The update log index is used for quickly retrieving relevant logs.
Keywords
mobile database; spatial database; GIS; consistency control; log data;
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