| Maintaining the consistency in distributed database system is a basic requirement. In recent years along with the rapid development of network, the consistency becomes a disquisitive hotspot again, especially in the heterochronous environment. The paper provides a discussion on the theory of distributed heterochronous database and Web Service. Then the paper puts forward a synchronous update system model, which applies Web Service to save and transfer transactions in the homogeneous distributed database system but not the same DBMS.In the design of this model, the concurrency control of distributed transactions and the method of failure inspect are discussed and solved successfully. Then on the basis of this model, the model is implemented by Java. Finally, the system is applied as a tool for DBA into a Student MIS in Computer Center of Inner Mongolia University of Science and Technology and solved the synchronous update successfully. So, the example proved that this system, which used Web Service as a means to visit the distributed heterochronous database, has following advantages: (1) It is more secure and more transparent. (2) If the architecture of database or the database management is changed, the service provider changes its service detail and redeploys this service simply. Thus, this system is easy to maintenance and has good extensibility. The method that is put forward in this paper made a bold and helpful try on the practicability of Web Service and the spread of peer-to-peer update method. Furthermore, the method attained favorable results in the application. |
