移动广播环境中两阶段实时事务处理  

Two-Stage Real-Time Transaction Processing in Mobile Broadcast Environments

作　　者：雷向东[1] 周美红[1] 赵跃龙[1] 陈松乔[1] 

机构地区：[1]中南大学信息科学与工程学院,长沙410083

出　　处：《系统仿真学报》2008年第21期5807-5811,共5页Journal of System Simulation

基　　金：国家教育部博士点基金(20030533011)

摘　　要：提出了移动广播环境中MVOCC-MDA-2PV并发控制协议。移动实时事务处理分两阶段进行。第一阶段在移动主机上处理,第二阶段在服务器上处理。移动主机上所有移动事务与在服务器上一个广播周期提交的事务进行预有效性确认。如果移动事务通过预有效性确认,提交到服务器进行最终有效性确认。协议消除了移动只读事务和移动更新事务的冲突,使用多版本动态调整串行次序技术,避免了不必要的事务重启动。移动只读事务无阻塞提交,降低了移动只读事务响应时间。模拟仿真实验结果表明MVOCC-MDA-2PV协议要优于其它协议。MVOCC-MDA-2PV concurrency control protocol was proposed for mobile broadcast environments. Mobile real-time transaction processing is performed in two stages. In the first stage transaction processing is performed at MH （Mobile Host）, and in the second stage at the server. At the MHs all mobile transactions perform pre-validation of transactions. The pre-validation process is carried out against committed transactions at the server in the last broadcast cycle. Transactions that survive in pre-validation in MH must be submitted to the server for final validation. The protocol can eliminate conflicts between mobile read-only transactions and mobile update transactions, and resolve data conflicts flexibly using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. Mobile read-only transactions can be committed with no-blocking. Respond time of mobile read-only transactions is greatly reduced. The results of simulation experiment show that MVOCC-DMA-2PV protocol performs better than other protocols.

关 键 词：移动实时数据库系统 多版本乐观并发控制 多版本动态调整 两阶段有效性确认 多版本数据广播 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]