Mobile Database Transaction Model And Implementation

Transaction processing is important for ensuring consistency and reliability of information. Traditional transaction processing is mainly applied in central or distributed DBMS, with characteristics of atomic, consistent, isolable, and durable. However, with the development of mobile communication technology, the research of mobile database arouses people's interest, and as one of the key technologies of mobile database, mobile transaction has been introduced in the mobile computing environment and becomes a hot topic of mobile database technology. The unique characteristic of mobile computing environment makes it more challengeable. Current mobile transaction models mainly focus on how to effectively handle the mobility, frequent disconnection, data consistency and recovery.In this paper, we first introduced the basic concepts of mobile transaction, and highlight its complexity and specialty by comparing the non-mobile transaction and mobile one. Its research status also is summarized. Then we deeply analyze and compare several typical mobile transactions models such as Kangaroo, Clustering etc. Basing on it, we propose a general mobile transaction processing model named RH-MT which supports the mobility, frequent disconnection and consistency of mobile transaction. Combination the thoughts from Kangaroo and O2PC models, in this model we use transaction queues to solve the mobility, and optimistic two phase commit to keep the data consistency. At last we developed a 3-tie (Mobile Host/Coordinator/Central Database) system to simulate the mobile transaction model, and which has been proved feasible and effective.