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We consider an environment in which a collection of mobile clients accesses a stationary database server via a wireless channel. Due to the limited bandwidth of a wireless chan- nel and the instability of the wireless network, caching of frequently accessed data items in a client's local storage be- comes especially important for improving the performance and data availability of data access queries. However, the network stability and high transmission bandwidth require- ments of existing caching mechanisms for conventional client- server and distributed database applications conflict with the mobility nature of mobile clients as well as the low-bandwidth of wireless channel. In this paper, we investigate issues that need to be addressed in caching mechanisms for a mobile en- vironment and propose an adaptive caching mechanism that could cope with the nature of a mobile environment as well as the low-bandwidth wireless media. The results of some preliminary exploratory experiments will also be illustrated to demonstrate the feasibility of our mechanism.

On adaptive caching in mobile databases