Background: Mobile distributed real time database is an emerging field of research.
Transaction execute in these system should commit before elapsing the deadline. Assigning priority
to arrived and executing transaction is the main function of transaction scheduler. Perform correct
order of execution enhance the system performance in time constraint environment. In recent
years a number of heuristic policies in DRTDBS are developed to enhance the quality estimation
of scheduler. However due to various wireless limitations a very little work is investigated in the
MDRTDBS. In this paper we have develop two heuristic policies and perform simulation using
pessimistic and optimistic concurrency control algorithm to enhance the system performance.
Objective: Two heuristic policies based on write only locks and number of same data item existence
has been introduced. These heuristic approaches enhance the performance of MDRTDBS
Methods: Develop two heuristic policies based on data contention which cope with CC policies
like DHP-2PL and FBOCC. These policies count the number of write only locks and existence of
number of same data item. Ultimately these policies enhance the system performance.
Results: Investigated the performance using simulator which is designed using C language. Based
on these simulation results using pessimistic and optimistic CCs different graphs are plotted which
shows the performance of system for these developed heuristic approaches. During simulation the
low and high workload of transaction arrival is taken to fair investigate of these heuristic approaches.
Conclusion: Simulation results show that the system performance is improved using these heuristic
approaches. However, NWL_Modified heuristic approach outperform in MDRTDBS than earlier