Research On Concurrency Control Mechanism In Grid Environment

Concurrency control mechanism is an important part of transaction managements in distributed database system, and it is one of the important symbols to measure the capability and function of DBS (Database System). The aim of the distributed concurrency control is to keep the consistency of the distributed transaction and DDB(Distributed Database),to realize the serializability of the distributed transaction and to make transaction have satisfactory concurrency. It is the target of the grid to enable the sharing of the geographically distributed and heterogeneous resources.Because the grid is heterogeneous, distributed, autonomous and dynamic,the traditional methods of concurrency control have not been suited to the grid. According to the characteristics of grid transaction, this thesis focuses on studying the mechanism of transaction management in grid,including transaction model and the methods of concurrency control.The main works are as follows:(1) Based on OGSA (Open Grid Service Architecture), a transaction model adopting the technology of mobile Agent in grid is presented,which seals the database in the local site as GDS (Grid Database Service).It not only supports the short-lived tranactions, but also long-lived ones, and satisfies the dynamic...