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Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any Triggers are simply stored procedures that are ran automatically by the database whenever some event (usually a table update) happens.A DML trigger is a trigger that is automatically fired. (executed) whenever an SQL DML statement (INSERT,. UPDATE, or DELETE) is executed. • You classify DML You create a trigger with the CREATE TRIGGER statement. You specify the triggering event in terms of triggering statements and the item on which they act. The Stored procedures – groups of SQL and PL/SQL statements – allow you to move code that enforces business rules from your application to the database. Performance Triggers in oracle are blocks of PL/SQL code which oracle engine can execute automatically based on some action or event. These events can be:. Triggers are PL/SQL programs that automatically fire (i.e. execute) when: Triggers can call database procedures, functions and packages.