Database Trigger

What Does Database Trigger Mean?

A database trigger is stored code that is executed immediately after a predefined event. It is used to ensure the coordinated performance of related actions. Although implementation varies, all major relational databases support triggers.


Techopedia Explains Database Trigger

For example, a human resources (HR) application requires that every employee manager receive an informational e-mail immediately after an employee’s leave request is submitted. When a record is written into a table that stores employee leave requests, a created trigger fires and invokes the e-mail-sending procedure to the manager.

Another common trigger use is to save important original data, in its unchanged state, to maintain an audit trail or ensure that the original data remains accessible in the event of accidental changes. For example, the same HR application may contain a trigger that is executed when an employee’s bank details are changed. The trigger first saves the original information to another table; this allows data modification.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…