Research And Realization Of Data Modification On Distributed Database

Data replication techniques are wide used in distributed database. Currently due to the various condition limits a slow network is still an important adoption as the enterprise applicable network and remote network. The existed distributed database replication techniques don't take 'the slow network's characters such as bandwidth and reliability for fully considered, so they are not applicable for the slow network scenario. On the other hand, the existing replication schemes can neither satisfy the enterprises' flexible and safe replication requirements nor support the replication between heterogeneous databases.The research content of this thesis based on the upward problems as follow:(1) Schema matching and schema conversion arithmetic is introduced, and data style is made uniquely in order to conversion from original data to unique data, it supports heterogeneous databases, and protects database relationship.(2)Timestamp and the method of capture data user define is proposed, which do not effect original system, aggravate databases burden, or use special function of database.(3) Improvement of the existed distributed database replication technique take advantage of little data transportation cost, and low network traffic and highly robust to less reliable network.(4) Implement in shared data of monopolization tobacco, data is transported from replication-nodes to center-node, data is analyzed and classified, and then distribute replication-nodes by center-node...