IMPACT OF HIGH-SPEED NETWORK ON PERFORMANCE OF REAL-TIME CONCURRENCY-CONTROL PROTOCOL

The impact of network layer assumptions on the performance of the conc urrency control protocol in distributed real-time database systems is studied by modeling the network layer as ATM networks instead of conve ntional simple constant delay centers. The results show that the unpre dictable behaviour of the underlying network will give non-constant ne twork transit time which in turn can cause significant adverse impact on the performance of the protocol. In this study, a dynamic deadline assignment scheme is proposed to reduce the impact of the underlying n etwork and to improve the system performance.