适用于实时数据库系统的并发控制协议  

Concurrency control protocol for real-time database system

作　　者：熊燕群[1] 李进京 

机构地区：[1]上海理工大学现代化教学中心,上海200093 [2]上海颐东网络信息有限公司,上海200233

出　　处：《计算机工程与设计》2009年第3期631-633,共3页Computer Engineering and Design

摘　　要：在实时数据库系统中,由于其事务处理的限时特性,对传统数据库访问的并发控制机制发出了挑战。从并发操作中常出现的3类冲突着手分析,在传统并发控制协议——两阶段锁(2PL)的基础上改进其封锁机制,提出一种新的并发控制协议。它以空间代价的付出换取并发度的提高,使等待时间和死锁现象大大减少,有效地满足了系统的实时性要求。The real-time database system is emerging. Because of the real-time demand of its transaction processing, the conventional concurrency control mechanism meets the serious challenge. Proceeding analysis on the three conflicts which often arise in concurrency operations, a new concurrency control is put forward based on the conventional Two-phase locking and improved its locking mechanism. The concurrency degree at the cost of room is enhanced so that the latency time and the deadlock phenomenon are greatly reduced, which effectively satisfy the real-time demand of system.

关 键 词：实时数据库系统 并发控制 封锁机制 两阶段锁协议 死锁 

分 类 号：TP311.133[自动化与计算机技术—计算机软件与理论]