Abstract
Two crucial issues in the schedulability of real-time transactions in a distributed environment are the predictability of the execution times of the transactions and the coexistence of hard, firm and soft real-time transactions. To-date, there are very few research studies which have addressed these two very important issues. In the present study. the model of a distributed real-time database system has been implemented to evaluate a new transaction scheduling scheme to handle problems relating to the two issues. Simulation results indicated that using different scheduling algorithms for difference classes of real-time transaction can achieve significant improvement in the system performance.
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