Distributed Multiversion Optimistic Concurrency Control for Mobile Real-Time Database Systems

In this paper, DMVOCC-MDA-2PLV protocol is proposed for processing mobile distributed real-time transaction in mobile broadcast environments. The new protocol can eliminate conflicts between mobile read-only and mobile update transactions, and resolve data conflicts flexibly using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. Mobile read-only transactions can be committed with no-blocking. Respond time of mobile read-only transactions is greatly improved. The tolerance of mobile transactions of disconnections from the broadcast channel is increased. The simulation results show that the new concurrency control protocol proposed offers better performance than other protocols.