Validation concurrency control protocol in parallel real-time database systems

作     者：LEI Xiang-dong(雷向东) YUAN Xiao-li(袁晓莉) 

作者机构：College of Information Science and Engineering Central South University Changsha 410083 China College of Information Science and Engineering Central South University Changsha 410083 China 

出 版 物：《Journal of Central South University of Technology》 (中南工业大学学报（英文版）)

年 卷 期：2002年第9卷第3期

页      面：197-201页

核心收录：

学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：国家高技术研究发展计划(863计划) 

主　　题：parallel database system real-time database concurrency control validation transactions 

摘      要：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 reveal that the protocol the author presented can effectively reduce the number of transactions restarting which might miss their deadlines and performs better than HP2PL 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.