Managing Contention and Timing Constraints in a Real-Time Database System

Previous work in real-time database management systems ( R T D B M S ) has primarily based o n simulation. This paper discusses how current real-time technology has been applied t o architect a n actual RTD B M S o n a real-time microkernel operating system. A real R T D B M S m u s t confront m a n y practical issues which simulations typically ignore: race conditions, concurrency, and asynchrony. The challenge of constructing a R T D B M S is divided into three basic problems: dealing with resource contention, dealing with data contention, and enforcing t iming constraints. In this paper, we present our approaches to each prob-