Using Logs to Increase Availability in Real-Time Main-Memory Database
IPDPS '00 Proceedings of the 15 IPDPS 2000 Workshops on Parallel and Distributed Processing
Concurrency control for mobile transactions
ACMOS'11 Proceedings of the 13th WSEAS international conference on Automatic control, modelling & simulation
Optimistic concurrency control in firm real-time databases
IWDC'05 Proceedings of the 7th international conference on Distributed Computing
Performance of distributed optimistic concurrency control in real-time databases
CIT'04 Proceedings of the 7th international conference on Intelligent Information Technology
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Although an optimistic approach has been shown to be better than locking protocols for real-time database systems (RTDBS), it has the problems of unnecessary restarts and heavy restart overhead. In this paper, we propose a new optimistic concurrency control protocol called OCC-DATI. In OCC-DATI the number of transaction restarts is minimized by dynamic adjustment of the serialization order of the conflicting transactions. The need for dynamic adjustment of the serialization order is checked and the serialization order is updated in the validation phase. This provides more freedom to adjust the serialization order of conflicting transactions.OCC-DATI has several advantages over other optimistic concurrency control protocols. The protocol maintains all the nice properties with forward validation, a high degree of concurrency, freedom from deadlock, and early detection and resolution of conflicts, resulting in both less wasted resources and a smaller number of restarts. All of these are important to the performance of RTDBSs and contribute to greater chances of meeting transaction deadlines. Performance studies of our protocol have been carried out in RTDBS and the results confirm that the performance of the OCC-DATI is better than other well-known OCC protocols.