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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., and Zimmermann J. Rules in an Open System: The REACH Rule System. In Proc. 1st International Workshop on Rules in Database Systems, Workshops in Computing, 1994, pp. 111–126.

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  2. Dayal U., Blaustein B.A., Buchmann S.C., et al. The HiPAC project: Combining active databases and timing constraints. ACM SIGMOD Rec., 17(1):51–70, 1988.

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  3. Dayal U., Blaustein B., Buchmann A., Chakravarthy S., and et al. HiPAC: A Research Project in Active, Time-Constrained Database Management. Tech. Rep. CCA-88-02, Xerox Advanced Information Technology, Cambridge, 1988.

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Author information

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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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Berndtsson, M., Mellin, J. (2009). Active Database Coupling Modes. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_503

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