The Research And Implementation Of Synchronization Mechanism In Mobile Database System

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. In such a mobile database model, the key issue is how to replicate and synchronize the data more efficiently while ensuring the data consistency.This thesis focuses on the research of the data replication and data synchronization technologies which are used in some of the commercial mobile database systems and experimental mobile database system prototypes. Based on these research works, we propose an evolutionary data synchronization mechanism which uses union-transaction result set as its granularity of synchronization. We take advantage of typical three-level architecture of mobile database solution to implement our system, and describe the key technologies which are used in client application (including embedded database management system), synchronization server and center database server in more details.In the last section of this thesis, we analyze the performance of this synchronization method and compare it with some other methods in several different aspects. A basic conclusion is given as the end of the thesis.