A New Priority Heuristic Suitable in Mobile Distributed Real Time Database System

Priority heuristic policies have been developed for centralized and distributed real time database systems where cohorts or sub transaction executed in sequential manner, however, these heuristics may not fit well for the mobile distributed real time database systems (MDRTDBS) where sub transactions are performing parallel execution and faces a lot of wireless challenges. In this paper, a MDRTDBS model has been introduced where sub-transaction executed parallel on different mobile sites and proposed a heuristic based on number of write locks. Proposed heuristic improves overall system performance by favoring sub transaction which demands lesser number of write locks. Further, a study has been done to evaluate impact of proposed heuristics with earliest deadline first and heuristic based on number of locks required using distributed high priority two phase locking protocol.