A Priority Inheritance Centered Locking Protocol for DRTDBS

In distributed real-time applications, the static 2 Phase Locking with High Priority (S2PL-HP) protocol may resolve data conflict(s) among transactions executing concurrently. S2PL-HP is virtuously free from the priority inversion that may arise due to executing–executing conflict—both the transactions in the execution phase. However, its performance may degrade because of other problems, i.e., cyclic restart and unnecessary abort, starvation of transactions of longer length, and system resource wastage. We propose a new Priority Inheritance (PRIN) centered locking protocol to resolve the above problems. PRIN checks the wastage of system resources by preventing cyclic restart and unnecessary abort using the priority inheritance approach. It is also free from deadlock and reduces the effects of lengthy transaction starvation. The system performance is measured using the transaction miss percentage metric. We developed the simulator to assess the performance of the proposed protocol; the results confirm that our system, PRIN, achieves 1.05 ×–1.23 × performance improvement over the state-of-the-art systems.