| With the development of hardware and corresponding software technology, mobile computing makes a quick progress and plays an important role in many fields. The advancement of mobile database system meets the requirement of data process in mobile computing environment.The replication mobile database system using the data replication and data synchronization technologies is a very important model of mobile database,which supports the data operations on mobile devices in disconnection situations.The synchronization and replication is one of the key technologies among these topics research of mobile transaction processing.At present because of the conditions of network and resources of mobile devices, mobile equipment can not connect network sustainably,the demands of data access can not be satisfied in the unconnected network.Application data,which accessed and updated offline can't be synchronized with the master database from time to time. Therefore mobile database data synchronization method is particularly important.The thesis focuses on this issue.This thesis has explored the mechanisms of synchronous replication of the mobile database system,and the structural characteristics of the mobile database systems.On this basis,it focuses on SQL Server merging with replication technology and data synchronization technology based on the XML-way,and analyses the advantages and disadvantages of the two synchronization methods.At the same time this thesis conducts in-depth discussions of the communications technology,and gives the data transmission packet analysis process based on the Socket.Finally, combining with the advantages of two kinds of data synchronizations,the thesis gives out a different data synchronization program based specific network to fulfil the practical project's requirement,which not only achieves the consistency of the data, but also improves the reliability of data synchronization. |
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