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In mobile database environments, multiple users may access similar data itemsirrespective of their physical location leading to concurrent access anomalies.As disconnections and mobility are the common characteristics in mobileenvironment, performing concurrent access to a particular data item leads toinconsistency. Most of the approaches use locking mechanisms to achieveconcurrency control. However this leads to increase in blocking and abort rate.In this paper an optimistic concurrency control strategy using on-demandmulticasting is proposed for mobile database environments which guaranteesconsistency and introduces application-specific conflict detection andresolution strategies. The simulation results specify increase in systemthroughput by reducing the transaction abort rates as compared to the otheroptimistic strategies proposed in literature.

A Real Time Optimistic Strategy to achieve Concurrency Control in Mobile Environments Using On-demand Multicasting