多版本两阶段封锁并发控制协议性能研究

Research of the Performances of Multiversional Two-Phase Locking Concurrency Control Protocols

在并行实时数据库中,并发控制协议不仅要满足数据库一致性约束,而且要满足时间约束。本文提出了实时多版本两阶段封锁并发控制协议,它能有效地减少延误截止时间事务数量。作者通过仿真模拟,在共享磁盘体系结构下与HP2PL和OCC TI WAIT 50协议进行了比较。实验结果表明,该协议比HP2PL和OCC TI WAIT 50协议性能更好。

In parallel realtime database systems, concurrency control protocols must not only maintain the consistency constraints, but also meet time constraints. The article presents a multiversional twophase locking concurrency control protocol. It can effectively reduce the number of transactions that miss their deadlines. We compare the protocol presented with the HP2PL protocol and the OCCTIWAIT50 protocol under the shareddisk architecture by simulation. The experimental results show that the protocol performs better than the other two.