DRDB: a distributed real-time database server for high-assurance time-critical applications

Many real time database systems are now being used in safety critical applications, in which human lives or expensive machinery may be at stake. Transactions in real time databases should be scheduled considering both data consistency and timing constraints. In addition, a real time database must adapt to changes in the operating environment and guarantee the completion of critical tasks. The effects of scheduling decisions and concurrency control mechanisms for real time database systems have typically been demonstrated in a simulated environment. We present a functional real time database server called DRDB, which provides an operational platform for research in distributed real time database issues.