| With the development of network computing environment technology, people can access data at any time from any location. It is possible because of the combination of rapid development and increasing grown-up mobile communication technology and computer technology and mobile computer. In the mobile computing, database is operated by large and weak function computers through wireless communication channel. It is formed mobile database, which is a new hierarchy structure. Mobile database is mainly composed of some pacing technologies: mobile transaction processing technology, mobile query optimization technology, copy and cache technology.One of the most important missions of transaction processing is maintaining the data consistency. The wide differences between mobile computing environment and static distributed computing environment make the traditional technology for this mission not suitable. Some more work needs to be done in this direction in order to accommodate the restrictions imposed by mobile environment.The problems of data consistency of mobile database are solved based on the research of copy and cache technology. First it is presented that transaction processing model of traditional database is limited to deal with transaction in mobile computing environment. And it is contrasted with mobile database.Thence it is processed variant degree research on data synchronism technology, cache consistency technology and variable consistency server replication. They are the very mainly contents of copy and cache technology. Data synchronism technology is the base of solving data consistency. Cache consistency technology and variable consistency server replication are of definite difficulty in solving data consistency.At last probability realization of mobile database weak transactions successfully submission is computed. Control of data operation power is presented. And offset degree of mobile transactions consistency. The method of probability... |
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