By Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen Hansson MSc (eds.)
The parts of energetic and real-time databases have obvious a massive progress of curiosity long ago few years, fairly in regards to their aid of time-critical and embedded functions. ARTDB-95 supplied, consequently, a massive discussion board for researchers from either groups to debate learn 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 comprises four invited papers at the following issues: the influence of energetic databases on advertisement perform; the optimization of energetic database transactions; the necessity for greater language, compiler and gear help for real-time databases; and the beginning of time constraints linked to facts, occasions and activities. jointly the papers supply a accomplished evaluate of present examine, and should supply precious interpreting for tutorial and business researchers and scholars at either undergraduate and postgraduate level.
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Extra info 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
Incremental Recomputation of Active Relational Expressions. IEEE Transactions on Knowledge and Data Engineering, vol 3, num 3, pages 337-341, September 1991. -W. Wang and E. N. Hanson. A Performance Comparison of the Rete and TREAT Algorithms for Testing Database Rule Conditions. In Proceedings of the Eighth International Conference on Data Engineering, Tempe, Arizona, pages 88-97, February 1992.  E. N. Hanson. Rule Condition Testing and Action Execution in Ariel. In Proceedings of the ACM SIGMOD International Conference on Management of Data, pages.
This problem has been studied in . The authors propose a caching strategy that analyzes the structure of all the rules in order to determine rule conditions that can be evaluated more than once, and for each such condition, the set of changes that occur between two consecutive evaluations. Based on this, an algorithm extracts the most profitable expressions to cache in each rule condition. The technique works for both set-oriented and instance-oriented rules. Clearly, the same optimization technique can be applied to ECA rules.
Finkelstein. Set-oriented production rules in relational database systems. In Proceedings of the ACM SIGMOD International Conference on Management of Data, pages 259-270, Atlantic City, New Jersey, May 1990. fr Abstract In this paper, we argue that in an active database system, the optimization of user transactions requires that rule and transaction optimization be considered together as a global problem. We propose a simple, yet general, way to model active database transactions. The execution of a user transaction, called a job, is represented as an external task (the user-submitted commands), and a set of condition and action tasks resulting from the triggering of active rules.