A real-time database system (RTDBS) differs from a conventional database system because in addition to the consistency constraints of the database, timing constraints of individual transaction need to be satisfied. To provide real-time response for queries and update while maintaining the consistency of data, real-time concurrency control should involve efficient integration of the ideas from both database concurrency control and real-time scheduling. The authors proposed hybrid real-time concurrency control protocols which combine pessimistic and optimistic approaches to concurrency control in order to control blocking and aborting in a more effective manner
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Research Issues on Data Engineering, 1992: Transaction and Query Processing, Second International Workshop on
Date of Conference: 2-3 Feb 1992