The database server tracks several kinds of system events. Event handlers are triggered when the system event is checked by the database server, and satisfies a provided trigger condition.
By defining event handlers to execute when a chosen system event occurs and satisfies a trigger condition that you define, you can improve the security and safety of your data, and help to ease administration.
For information on the available system events, see “Choosing a system event.” For information on trigger conditions, see “Defining trigger conditions for events”.