Download Active and Real-Time Database Systems (ARTDB-95): by Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen PDF

By Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen Hansson MSc (eds.)

ISBN-10: 3540199837

ISBN-13: 9783540199830

The components of energetic and real-time databases have noticeable an important progress of curiosity some time past few years, fairly in regards to their help of time-critical and embedded functions. ARTDB-95 supplied, for this reason, a major discussion board for researchers from either groups to debate study effects, and likewise to chart new instructions for the long run. in addition to the eleven submitted papers awarded on the workshop, this quantity additionally includes four invited papers at the following issues: the impression of energetic databases on advertisement perform; the optimization of lively database transactions; the necessity for higher language, compiler and power aid for real-time databases; and the foundation of time constraints linked to facts, occasions and activities. jointly the papers supply a accomplished evaluation of present learn, and may offer beneficial interpreting for educational and business researchers and scholars at either undergraduate and postgraduate level.

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Read or Download Active and Real-Time Database Systems (ARTDB-95): Proceedings of the First International Workshop on Active and Real-Time Database Systems, Skövde, Sweden, 9–11 June 1995 PDF

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Extra resources for Active and Real-Time Database Systems (ARTDB-95): Proceedings of the First International Workshop on Active and Real-Time Database Systems, Skövde, Sweden, 9–11 June 1995

Example text

An external preemptive synchronization point succeeds all the condition tasks activated by the action task or the ET that immediately precedes the previous synchronization point. • an external preemptive synchronization point succeeds each action task selected by the selectO function at the previous synchronization point. • at a synchronization point p: if p succeeds the ET or an action task then the selectO function selects all the condition tasks activated by the action task or ET and execute them in parallel; otherwise, if p succeeds a set of condition tasks, then selectO returns one action task activated by this set.

It turns out that most of the proposed techniques for rule processing do not exactly apply in an active database framework, as we shall see later in this paper. Also, concurrency control pmtocols implemented by active database systems are identical to the protocols found in passive database systems. A noticeable point is that the two problems of rule and transaction optimization have been studied separately. In this paper, we precisely defend the thesis that in an active database framework, the optimization of user transactions requires that rule and transaction optimization be considered as a global problem.

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