Mixed Mobile and Fixed Transactions Scheduling in Mobile Computing Environment

As technological advances are made in software and hardware, the feasibility of accessing information "any time, anywhere" is becoming a reality. In a mobile computing environment, a potentially large number of mobile and fixed users may simultaneously access shared data; . In this paper, we have addressed the problem and devised an effective OCC protocol with deferred adjustment of serialization order, called OCC-DF, for MDBS with mixed transactions. The characteristics of the OCC-DF protocol have been examined in detail by simulation. The results show that the performance of the OCC-DF protocol is consistently better than OCC-TI protocol over a wide range of system settings. In particular, the OCC-DF protocol provides a more significant performance gain in mixed transaction environments.