Institut für Informatik III der Rheinischen Friedrich-Wilhelms-Universität Bonn Time-based Triggers for SQL: A Lingering Issue Revisited
نویسندگان
چکیده
Being able to activate triggers by timepoints reached or time intervals elapsed has been acknowledged by many authors as a valuable functionality of a DBMS. Recently, the interest in time-based triggers has been renewed in the context of data stream monitoring. However, up till now SQL triggers react to data changes only, even though research proposals and prototypes have been supporting several other event types, in particular time-based ones, since long time. We therefore propose a seamless extension of the SQL trigger concept by time-based triggers, focussing on semantic issues arising from such an extension.
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