Research of Cache Mechanism in Mobile Data Management

It can improve the performance of mobile data management by caching the frequently accessed and infrequently updated data items. In this paper, a cache replacement policy called Update-based Minimal Access Cost Replacement (UMACR) was proposed to remedy the defects of the existing cache replacement policies such as GDSF and OUR. A variety of factors such as sizes of data items, data access and update information were taken into account in UMACR. To facilitate the replacement policy, two enhanced cache access policies called Update-Server-based Poll-Each-Read (USBPER) and Update-Client-based Call-Back (U2CB) were introduced to guarantee the consistency of data items. USBPER and U2CB remedied the defects of the existing cache access policies such as UPER and UCB by considering updates happening both at the server and clients. Conflict detection and handling was also implemented at the server. At last, we conducted a lot of simulation experiments of mobile data management, and the results demonstrate that the policies we proposed are effective enough, which lay a solid foundation for further research.