The Research For Replication And Caching On The Basic Of Mobile Database

Mobile database system to support mobile computing refers to a particular computing model, or database management systems, database systems and operating systems, application-specific integrated together, run in a variety of smart embedded devices or mobile devices. Along with office equipment in recent years, more and more to the development of smaller, customized user demand increases, as well as with a GPRS Internet-enabled Pocket PC, mobile phones and other electronic products continue to emerge, enabling mobile database to be spread more in-depth, development, and application. The replication cache technology as the mobile database, one of key technologies, it is a very active research topic.In this paper, through studying the mobile database characteristic analysis and model, the mobile database replication techniques, the main method and caching, according to their respective advantages based PDA on-site mobile office information system, and puts forward a practical method based on user-oriented 3 replication cache the strategies in duplicate cache data, classification based on the user's data increased. First level cache described the whole strategy replication strategy, and then introduce user-oriented data, a detailed description of concrete in each layer. This strategy in the field of office based PDA mobile information system was set up through the analysis of data structure mode, the definition, classification and application of data transmission webservice technology application, and application effect..