Efficient Cache Management Protocol Based on Data Locality in Mobile DBMSs

In mobile client-server database systems, caching of frequently accessed data is an important technique that will reduce the contention on the narrow bandwidth wireless channel. As the server in mobile environments may not have any information about the state of its clients’ cache(stateless server), using broadcasting approach to transmit the list of updated data to numerous concurrent mobile clients is an attractive approach. In this paper, a new caching method is proposed to support transaction semantics at mobile clients. The proposed protocol adopts adaptive broadcasting as the way of sending invalidation reports, in order to dynamically adapt to system workload (update pattern, data locality). We study the performance of the proposed protocol by means of simulation experiments.