Oscar-based Mobile Database Transaction Management Framework

More and more, we need to access any data at anytime, anywhere. The conjunction of mobile communication technique and mobile computer meet this requirement. In the future mobile computing environment, a lot of computers may access the database Through the wireless channel. That is the new computing structure mobile database. Mobile transaction management must accommodate many limits of mobile computing environment: the unreliable and low band-width communication between the Mobile Unit and the Mobile Support Station; limited battery life and reduced compute capacity of the Mobile Unit. Besides, the mobility and the long-time properties of mobile transactions made mobile transaction management a challenge. In this paper, we introduce our own mobile transaction management framework based on the OSCAR DBMS and many exist mobile transaction management models. We designed a lot of strategies to build this framework: We use split-transaction operation and 3-level transaction to.describe the mobility and long-time properties of mobile transaction; We extend the SI to the mobile environment to get both data availability and correctness of concurrency control; We distinguish mobile subtransaction and static subtransaction to harmonize the autonomy of MU and the intervention of DBMS; We use data broadcasting to broadcast the data in the DBMS accessed by MUs in order to satisfy the MUs?access through cache In all, our mobile transaction management framework is an integrated framework that is not only renewal of the existed mobile transaction models but also an important attempt to the truly mobile database. The rest of the chapter is organized as follows. Section 1 summarizes the mobile environment and mobile database, Section 2 discusses the properties of mobile transaction management and some existed transaction models of other people. Section 3 introduces the transaction management strategy of the original OSCAR. Section 4 discusses the whole framework based on Section 2 and Section 3. Section 5 makes some sum-up things.