移动实时提交协议的恢复处理与通信分析  

The Failure Recovery and Communication Overhead Analyzing of A Mobile Real-time Commit Protocol

作　　者：廖国琼[1] 刘云生[1] 

机构地区：[1]华中科技大学计算机学院,武汉430074

出　　处：《计算机工程与应用》2004年第23期24-25,58,共3页Computer Engineering and Applications

基　　金：国家自然科学基金项目(编号:60073045);中国博士后基金项目(编号:2003034482);国家部委预先研究项目;华中科技大学博士后科学基金项目(编号:2003021)项目资助

摘　　要：三层实时提交协议(3LRTC)是为支持事务移动性、断接性、实时性及功能替代性等设计的一种移动实时提交协议,该协议能保证移动分布式实时事务放松原子性和结构正确性。该文在分析移动实时事务各参与者提交状态变化的基础上,讨论了3LRTC在发生场地故障和断接时的恢复处理方式,以保证故障发生后数据库能恢复到一个正确的状态。该文还对3LRTC的通信代价进行了分析与比较,结果表明,三层提交结构能减少移动实时事务的通信消息数。LRTC is a three-tier real-time commit protocol designed for supporting mobility,disconnection,real-time and functional alterative,which can guarantee relaxed atomicity and correctness of mobile distributed real-time transactions.In the paper,based on the commit -state -graph of different participants,the process ways to recovery of3LRTC are discussed in the situations of site failures and disconnection.In addition,the communication overhead of3LRTC is analyzed.It is shown that fewer messages are needed for three-tier structure than two-tier structure in mobile real-time transactions with functional alterative tasks.

关 键 词：移动计算 实时事务 功能替代 三层实时提交协议 3LRTC 嵌套事务模型 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]