Research And Implementation Of Synchronization Of Database System Based On MRB

Recently, with the rapid development of computer network and digital communication technology, the applications of distributed database increase. The distributed database is a database system of which the data is physically distributed but logically centralized. In order to get a higher usability, reliability and security, also to improve the effect of system, we usually use replicas in distributed database system. So how to maintain the consistency of the replicas is becoming a key problem in distributed database system, which is also the main study of this thesis.At present, in the fields of the distributed database, many methods have been put forward to maintain the data consistency, but they all have certain limits on applications. As a result, which method is the most suitable one to be taken to maintain the data consistency in our actual project becomes one of the most important problem.Based on having studied and deeply analyzed diversified methods for maintaining data consistency now exist, and compared the advantages between them, this thesis, combining the theory of message queue method and replicas control method, designs and realises a kind of system which is based on message queue MRB. This thesis addressed itself on the design thinking and work theory of the database synchronous system in detail, and what's more it puts emphases on investigating several important problems that will be met when developing the message queue based database synchronous system, such as how to realise the data transmitting by using the message queue; how to deal with the conflict problems caused by the parallel execution of transactions, how to solve the faulty problem and so on.