부산대학교 도서관

Caching at the mobile client is prospective technique that can reduce the number of uplink requests, lighten the server load. However, Variable data size, data updates, limited client resource and irequent client disconnection make cache management a challenge. object caching is often used to improve the performance of mobile application. Consistencv approach to maintaining cache consistencv with the use of Invalidation (or) update reports. The server periodicallv broadcasts updates (or) invalidation report to clients. update report reflect the changes in the state database. A drawback of this method is that invalidation report impose a high processing load on clients. clients have to listen to all report, even through there may be no changes in the data caching. With the aim of reducing the cache consistency maintenance work. I have proposed agent based mechanism to save wireless bandwidth, reduce network traffic and reduce the workload in server. Based on the mechanism derived queuing model for the simulation. Moreover Ns2 simulation performance were analyze the result proposed technique over existing system Keywords: mobile database, wireless networks, database cache, threads Agent.
1. Introduction Mobile computing environments are characterized by slow wireless links and relatively underprivileged hosts with limited battery powers, predisposed to frequent disconnections. Caching data at the Mobile Hosts (MHs) [...]