Timer and counter triggers in RAPID

Antoni Wolski

Research output: Book/ReportReport


Triggers are event-condition-action rules in active databases. In order to improve the power of expression of triggers, the event part is typically modeled as a composite event or an event expression. We propose to model events as finite state automata of pre-defined types. We show how two example triggers types may be defined using a trigger definition language based on SQL3. The timer trigger is a trigger based on the timer automaton, and the counter trigger is based on the counter automaton. The approach results in a intuitive and simple triggers definition syntax and it allows for a stepwise trigger system implementation in object-oriented environments. The discussed triggers were implemented in the RAPID systemDa temporal and active fast-response database system for industrial applications.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages15
Publication statusPublished - 1995
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Research Report


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