Dynamic Strategy For The Cache Of Mobile Client And Consistent Maintenance In Mobile Database

The mobile database is a branch of the study of Distributed Database and Distributed computing. The mobile database can be thought as the extend of the traditional Distributed Database. But as the difference character between the mobile computing and the traditional distributed environment, the technique for distributed database can't be used in mobile database completely.On the background of mobile environment of customer relationship management, this paper analyses the difference between the mobile database and distributed database and the problem of the mobile database faced. Firstly ,it analyses the architecture of mobile database and then provides some studies about data classify , data partition , data replication and cache in mobile client. And after that this paper provides a dynamic strategy to manage the cache of mobile client.The strategy is to realize the target of the mobile database that it must provide the constantly disconnection and the available data during disconnection for mobile client. There are three state of cache in mobile client-connection, disconnection and integration. Each data that put into cache has attribute of data priority and data sort. It update the content of the cache according to the result of the transaction and the demand of mobile user. Because of the limit of the cache capability, it replace the cache according to the data priority. And this paper also provides a bidirectional method to contain the delay consistency based difference synchronization.