Concurrency Control in Real-Time Database Systems.

Abstract

rn applications of RTDBSs concern military command and control, aerospace systems, aircraft control, traffic control, telecommunication and computer network management, telephone directory service systems, computer integrated manufacturing (CIM), factory automation and robotics, workflow systems, medical monitoring, stock arbitrage systems, multimedia systems. All the above applications make substantial use of databases, but also require support for timeliness, which is not provided by traditional databases. The wider application of RTDBSs in practice depends on solving several important problems concerning the performance requirements of such systems, and specially meeting transaction deadlines. In computer systems the performance can be increased by allowing concurrent execution of operations. The activity of coordinating concurrent access of transactions to shared data in DBSs is called concurrency control. Concurrency control algorithms should ensure consistency of the database an