(1) In a CREATE TRIGGER statement, the specification of an insert, update, or delete operation on a specified table that activates the trigger. See also trigger activation, trigger activation time, triggered action, trigger granularity.
(2) A change operation that calls the trigger action to be run. The trigger event can be an insert, update, or delete operation in any high-level language and in SQL.
(3) An event, such as a message arriving on a queue, that causes a queue manager to create a trigger message on an initiation queue.