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Active Database Coupling Modes

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Encyclopedia of Database Systems

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Definition

Coupling modes specify execution points for ECA rule conditions and ECA rule actions with respect to the triggering event and the transaction model.

Historical Background

Coupling modes for ECA rules were first suggested in the HiPAC project [2, 3].

Foundations

Coupling modes are specified for event-condition couplings and for condition-action couplings. In detail, the event-condition coupling specifies when the condition should be evaluated with respect to the triggering event, and the condition-action coupling specifies when the rule action should be executed with respect to the evaluated rule condition (if condition is evaluated to true).

The three most common coupling modes are immediate, deferred, and decoupled. The immediate coupling mode preempts the execution of the transaction and immediately initiates condition evaluation and action execution. In the deferred coupling mode, condition evaluation and action execution is deferred to the end of the transaction (before...

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Recommended Reading

  1. Branding H, Buchmann A, Kudrass T, Zimmermann J. Rules in an open system: the REACH rule system. In: Proceedings of the 1st International Workshop on Rules in Database Systems, Workshops in Computing; 1994. p. 111–26.

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  2. Dayal U, Blaustein BA, Buchmann SC, et al. The HiPAC project: combining active databases and timing constraints. ACM SIGMOD Rec. 1988a;17(1):51–70.

    Article  Google Scholar 

  3. 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; 1988b.

    Google Scholar 

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Author information

Authors and Affiliations

  1. University of Skövde, The Informatics Research Centre, Skövde, Sweden

    Mikael Berndtsson & Jonas Mellin

  2. University of Skövde, School of Informatics, 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, GA, USA

    Ling Liu

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

    M. Tamer Özsu

Section Editor information

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

    M. Tamer Özsu

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Berndtsson, M., Mellin, J. (2018). Active Database Coupling Modes. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_503

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