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Active Database Execution Model

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Encyclopedia of Database Systems

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Definition

The execution model of an active database describes how a set of ECA rules behave at run time.

Key Points

The execution model describes how a set of ECA rules (i.e., active database rule base) behave at run time [2, 4]. Any execution model of an active database must have support for (i) detecting event occurrences, (ii) evaluating conditions, and (iii) executing actions.

If an active database supports composite event detection, it needs a policy that describes how a composite event is computed. A typical approach is to use the event consumption modes as described in Snoop [1]: recent, chronicle, continuous, and cumulative. In the recent event context, only the most recent constituent events will be used to form composite events. In the chronicle event context, events are consumed in chronicle order. The earliest unused initiator/terminator pair are used to form the composite event. In the continuous event context, each initiator starts the detection of a new composite...

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Recommended Reading

  1. Chakravarthy S, Krishnaprasad V, Anwar E, Kim SK. Composite events for active databases: semantics contexts and detection. In: Proceedings of 20th international conference on very large data bases; 1994. p. 606–17.

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  2. Dayal U, Blaustein B, Buchmann A, Chakravarthy S. et al. HiPAC: a research project in active, time-constrained database management. Technical report CCA-88-02. Cambridge: Xerox Advanced Information Technology; 1988.

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  3. Gehani N., Jagadish HV, Smueli O. Event specification in an active object-oriented database. In: Proceedings of ACM SIGMOD international conference on management of data; 1992. p. 81–90.

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  4. Paton NW, Diaz O. Active Database Systems. ACM Comput. Surv. 1999;31(1):63–103.

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  5. Widom J, Finkelstein S. Set-oriented production rules in relational database systems. In: Proceedings of ACM SIGMOD international conference on management of data; 1990. p. 259–70.

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Authors and Affiliations

  1. University of Skövde, Skövde, Sweden

    Mikael Berndtsson & Jonas Mellin

Authors
  1. Mikael Berndtsson
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  2. Jonas Mellin
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Corresponding author

Correspondence to Mikael Berndtsson .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, Georgia, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, Ontario, Canada

    M. Tamer Özsu

Section Editor information

  1. Cheriton School of Computer Science, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

    M. Tamer Özsu

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Berndtsson, M., Mellin, J. (2017). Active Database Execution Model. In: Liu, L., Özsu, M. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-7993-3_509-2

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  • DOI: https://doi.org/10.1007/978-1-4899-7993-3_509-2

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4899-7993-3

  • Online ISBN: 978-1-4899-7993-3

  • eBook Packages: Springer Reference Computer SciencesReference Module Computer Science and Engineering

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