实时数据库系统并发控制机制综述  

Overview of Concurrency Control in Real-time Database Systems

作　　者：祁鑫[1] 王文海[1] 

机构地区：[1]浙江大学现代控制工程技术研究所工业控制技术国家重点实验室,杭州310027

出　　处：《化工自动化及仪表》2006年第1期47-50,共4页Control and Instruments in Chemical Industry

摘　　要：实时数据库系统的并发控制协议通常是通过对传统非实时数据库并发控制协议的扩展和改进并结合实时系统的研究成果得到的。通过将实时数据库并发控制协议归结为保守的和乐观的两类来研究,分析了基本的两段锁和乐观并发控制协议的工作机制,并分别介绍了在两段锁协议基础上发展的高优先级两阶段锁协议,最高优先级限度协议以及在乐观并发控制协议基础上发展的OCC-BC协议,WAIT-50协议等。对实时数据库系统事务的最新发展趋势的研究表明并发控制机制的研究向着对两阶段锁协议和OCC协议新的改进和对二者的混合应用方向发展,比较有代表性的RCP协议和OCC-DA协议都有着很好的表现。Real-time database system derives its concurrency control mechanisms from traditional ones and results of real-time systems. Classifying real-time concurrency control protocols as either conservative （ e. g. ,locked-based） or optimistic concurrency control protocols, the research analyses mechanisms of the basic 2PL protocol and the OCC protocol as well as 2PL-HP protocol and the PCP protocol which derive from 2PL protocol and the OCC-BC and the WAIT-50 those extend the OCC protocol. Keeping focus on resent work of RTDB systems makes it clear that protocols mixed with the two types or extended from one become more and more popular. The famous RCP protocol and the OCC-DA protocol both get excellent performance in practice.

关 键 词：实时数据库 并发控制机制 串行化顺序 两段锁 乐观并发控制 

分 类 号：TP336[自动化与计算机技术—计算机系统结构]