Research And Implementation For The Key Technology Of Mobile Real-time Embedded Database

Mobile computing with low bandwidth, mobility, frequent disconnection, non symmetry of network communication, electric power is finite wait for a characteristic, making the traditional distributed database technology and the method can not be directly applied to the mobile database. According to the features of mobile computing environments, the study of new processing method has become a new research hotspot.The synchronization and replication is a critical technology of mobile database, and important means to keep consistency between the terminal and a central serve. After in-depth analysis and study of several typical synchronization and replication model and transaction processing mechanism, we use the thought of the first-level and third-level replication technology in the three replicate replication model. And each module has been designed and implemented.Each module in the design and implementation.In this model, we use transaction-level synchronization mechanism, and version comparison method for conflict detection at the central server. Meanwhile, according to end-user access to the classified data in the database, terminal selectively download and subscription data.Finally, this thesis demonstrates information about the test about all modules in terms of system performance and system function meet to the requirements of replication, the application of this system has a certain practical significance.