The Study Of Concurrency Control For Distributed Database

In recent years, along with the extensive application of the distribute system, the distribute database has become an important link within the information processing.A distributed database system consists of user interface subsystem, directory management subsystem, compile subsystem, distributed transaction management and concurrency control subsystem, data implement system, recovery subsystem etc. Among the parts, the realization of the concurrency control is a very complicated process. Meanwhile, it is also a very important and necessary part of the distributed database system , which manipulates concurrent action of some transactions. Beginning with the construction of precedence graph and topological sort.This paper first introduces the research of database concurrency control, and then discusses the interference between concurrent transactions . Three kinds of concurrency control techniques are provided. They are respectively locking method, timestamp method and optimistic method. This paper presents a new algorithm which is usefuo to concurrency control of distributed database system.