An algorithm modelling primary copy two-phase locking with integrated mechanism of timestamps

Abstract

The following paper presents a model of algorithm for primary copy two-phase locking (2PL). To avoid deadlocks of distributed transactions in distributed database management systems is used a timestamps mechanism. From the two strategies for timestamps mechanism for deadlocks avoiding, we consider the "wound -- wait" strategy. In the paper is presented a comparative variant of the results from the modelling in GPSS World Personal Version environment of the two algorithms: "wait-die" method and "wound -- wait".