Validation concurrency control protocol in parallel real-time database systems
来源期刊：中南大学学报(英文版)2002年第3期
论文作者：雷向东 袁晓莉
文章页码：197 - 201
Key words：parallel database system; real-time database; concurrency control; validation; transactions
Abstract: In parallel real-time database systems, concurrency control protocols must satisfy time constraints as well as the integrity constraints. The authors present a validation concurrency control(VCC) protocol, which can enhance the performance of real-time concurrency control mechanism by reducing the number of transactions that might miss their deadlines, and compare the performance of validation concurrency control protocol with that of HP2PL(High priority two phase locking) protocol and OCC-TI-WAIT-50(Optimistic concurrency control-time interval-wait-50) protocol under shared-disk architecture by simulation. The simulation results re- veal that the protocol the author presented can effectively reduce the number of transactions restarting which might miss their deadlines and performs better thanHP2PL and OCC-TI-WAIT-50. It works well when arrival rate of transaction is lesser than threshold. However, due to resource contention the percentage of missing deadline increases sharply when arrival rate is greater than the threshold.
