Definition
In active databases, an explicit event is explicitly specified in the ECA rule definition.
Key Points
ECA rules were developed as an optimization of condition action rules. The performance of rule evaluation was improved by allowing, or even requiring, explicit definition of when rules should be triggered in the form of events. For example, (ON updateAfollowed_by updateBIF A = 5∧ B = 3 DO action) is a rule specification that is triggered by the explicit event updateAfollowed_by updateB (i.e., a sequence of updates).
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Mellin, J., Berndtsson, M. (2018). Explicit Event. 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_515
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DOI: https://doi.org/10.1007/978-1-4614-8265-9_515
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