Integrating Temporal, Real-Time, and Active Databases

To meet the needs of many real-world control applications, concepts from Temporal, Real-Time, and Active Databases must be integrated: ffl Since the system's data is supposedto reflect the environment being controlled, they must be updated frequently to maintain temporal validity; ffl Many activities, including those that perform the updates, work under time constraints; ffl The occurrence of events, for example, emergency events, trigger actions. In these systems, meeting timeliness, predictability, and QoS guarantee requirements -- through appropriate resource and overload management -- become very important. So, algorithms and protocols for concurrency control, recovery, and scheduling are needed. These algorithms must exploit semantics of the data and the transactions to be responsive and efficient. Whereas time cognizant scheduling,concurrency control and conflict resolution have been studied in the literature, recovery issues have not. We have developed strategies for data pl..