Traditional concurrency control methods can ’ t be well applied to resolve these problems in a loosely - coupled environment . the application constructor has no central control on resources provided by autonomous business entities . since the business process is long - running , the providers may not be willing to lock resources exclusively for such long period , and serialization by locking resource will raise serious scalability issues 傳統(tǒng)的并發(fā)控制方法并不完全適應(yīng)web服務(wù)環(huán)境下松耦合應(yīng)用集成的特點(diǎn),主要表現(xiàn)在:資源是自治的,無法對來自不同提供者的資源進(jìn)行集中控制;業(yè)務(wù)流程的復(fù)雜性使流程的執(zhí)行跨越較長的時間,一方面資源提供者可能不愿意長時間地鎖定資源,另一方面運(yùn)用加鎖等串行化方法將導(dǎo)致并發(fā)度降低,嚴(yán)重影響利用效率。
This paper analysis the shortage of traditional concurrency control method in multidatabase and brings froward a new concurrency control algorithm . we also bring forward a new recovery method for multidatabase : synthesis 2pc protocol , which combines many multidatabase recovery methods into one algorithm , and makes the algorithm more useful and more efficient 本文還提出了一種新的多庫系統(tǒng)恢復(fù)機(jī)制:綜合2pc協(xié)議,它把已有的幾種多庫系統(tǒng)恢復(fù)機(jī)制結(jié)合在一個算法中使用,使其更適于多庫系統(tǒng)的異構(gòu)性,應(yīng)用范圍更為廣泛,效果也更好。