parm = value
When a triggering condition causes an event handler to execute, the database server can provide context information to the
event handler using the event_parameter function. The TRIGGER EVENT statement allows you to explicitly supply these parameters,
to simulate a context for the event handler.
Actions are tied to particular trigger conditions or schedules by a CREATE EVENT statement. You can use the TRIGGER EVENT
statement to force the event handler to execute, even when the scheduled time or trigger condition has not occurred. TRIGGER
EVENT does not execute disabled event handlers.
Each value is a string. The maximum length of each value is limited by the maximum page size specified by the -gp server option. If the length of value exceeds the page size, the string is truncated at the point at which the page is full.