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中南大学学报(自然科学版)

Journal of Central South University

第36卷    第5期    总第165期    2005年10月

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文章编号:1672-7207(2005)05-0852-06
实时主动数据库并发控制协议
雷向东,赵跃龙,袁晓莉

(中南大学信息科学与工程学院,湖南长沙, 410083)

摘 要: 提出了实时主动数据库系统实时多版本两阶段封锁并发控制协议(RTMV2PL)。该协议将多版本并发控制的优点和两阶段封锁并发控制机制优点结合起来。多版本两阶段封锁机制消除了只读事务和更新事务的冲突,只读事物从不重启动。对实时主动数据库系统的事务优先级重新定义。通过模拟仿真与传统的HP2PL和OCC-TI-WAIT-50协议进行比较。研究结果表明,并发控制协议不但能有效地降低事务的重启动率和延误截止时间率,而且提高只读事物的响应时间。当事务触发率高,导致系统负载高时,它的性能仍比其他协议的性能好。

 

关键字: 实时数据库系统;主动数据库系统;并发控制;多版本两阶段封锁协议

A concurrency control protocol in real-time active database systems
LEI Xiang-dong, ZHAO Yue-long, YUAN Xiao-li

School of Information Sciences and Engineering, Central South University,
 Changsha 410083, China

Abstract:Real-time multiversion two-phase locking (RTMV2PL) concurrency control protocol was presented for real-time active database systems(RTADBSs). The protocol presented combines the advantages of multiversion concurrency control mechanism with the advantages of two phase locking. Multiversion two-phase locking mechanism eliminates the conflicts between readonly and update transactions. Read-only transactions are never restarted. The priority of transactions is redefined for RTDABSs. The protocol presented is compared with concurrency control HP2PL and OCC-TI-WAIT-50 protocol by simulation experiments. The simulation results show that the new protocol can not only effectively reduce the miss rate of transactions and the restart rate of transactions, but also significantly improve the response time of read-only transactions. When transaction triggering probability is higher, which results in increasing system load, RT-MV2PL still performs better than other protocols.

 

Key words: real-time database systems; active database systems; concurrency control; multiver-
sion two phase locking protoco

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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