The use of calendars to schedule jobs is called predictive scheduling. Jobs are scheduled and automatically placed in the tracking file on the days you specify, using calendars.
The use of triggers and message actions to schedule jobs is called event‑based scheduling. Event‑based scheduling is event driven--a message action starts when a trigger is tripped.
Both approaches have inherent strengths and weaknesses, and most enterprises use a combination of the two, using predictive scheduling for the bulk of their workload and event‑based scheduling for exception event processing.
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