Definition
Coupling modes specify execution points for ECA rule conditions and ECA rule actions with respect to the triggering event and the transaction model.
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
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.
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.
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.
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Berndtsson, M., Mellin, J. (2017). Active Database Coupling Modes. In: Liu, L., Özsu, M. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-7993-3_503-2
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DOI: https://doi.org/10.1007/978-1-4899-7993-3_503-2
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