Cache Management for Concurrent Transaction Execution in Mobile Wireless Environment

Problem statement: Improvement in mobile communication technology and increased capability of mobile devices has made transaction processing possible with mobile devices. Transactions access services provided by the data server connected to the packet data network. Direct data access may overload the network and server. Data items are cached to improve data availability. The cache should be managed and maintained effectively to support concurrent transaction execution in mobile wireless environment. This study proposes a cache management strategy that includes cache invalidation and replacement. Approach: The contents of the cache are invalidated based on the predicted life time of the data item and the cache contents are replaced based on the degree of sharing. The count of dependent transactions determines the degree of sharing of the data item. Results: The experimental results ensure reduced stale hit probability and restart probability of the proposed PLP based cache invalidation technique. The proposed cache replacement policy improves the cache hit ratio at least by 20% when compared to the existing replacement policies. Conclusion: The proposed cache invalidation strategy and replacement policy suit well for concurrent transaction execution environment where the degree of data sharing and the dynamism in data update need to be considered.