基于验证因子的实时多版本并发控制.pdf

ISSN 计算机研究与发展 1000—1239／CN11—1777／TP4 of Researchand Journal Computer Development 基于验证因子的实时多版本并发控制 郝忠孝1’2’3韩启龙1 1(哈尔滨工业大学计算机科学与技术系哈尔滨 150001) 2(哈尔滨理工大学计算机科学与技术系 哈尔滨 150080) 3(齐齐哈尔大学计算机学院齐齐哈尔 161006) (hanqilong@hit．edu．cn) onValidation Real-TimeMultiversion ControlBased Factor Concurrency Hao andHan Zhongxia01·2Qilon91 and Institute Science 150001) 1(DepartmentofComputer Technology，HarbinofTechnology，Harbin Scienceand Scienceand 1 of of 50080) 2(DepartmentComputer Technology，HarbinUniversity Technology，Harbin 161006) 3(CollegeofComputer，QiqiharUniversity，Qiqihar AbstractTo the of overloadthatiscaused transactionrestartswith solveproblemsystem byunnecessary controlinreal—timedatabase validation anda new optimisticconcurrency systems，a factor(VF)concept methodreal—timemultiversion controlbasedonVF(MVOCC—VF)are called concurrency proposed．By the fransactionwith finished isscheduled VF，the combining checking higher degree preferentially．By are thenear— multiversionmechanism，thetransactionnumbers unnecessary decreased，especiallyensuring transactionstobe and to-completed accomplished．Theoreticalanalysisexperimentalresults thatthenewmethodcan the o