What are Database Triggers?

A database trigger is code that executes server-side logic when a database event occurs, such as when data is added, updated, replaced, or removed.

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FAQ

Code that is automatically triggered by a database operation or an event/schedule.

There are three types of triggers in MongoDB Atlas. One is the Database trigger used for updating data based on some action, and another is the Scheduled trigger used to execute a set of code at a specific time. On the Realm applications, there is also an Authentication trigger type used for events related to application user authentication.

MongoDB database triggers are stored at the Project level of an Organization in a specific Realm application. (Atlas triggers will provision this application automatically for you.)

A trigger can be used for many use cases, like updating a Last Updated date when an edit is made on a document, recording the last Login Date on a User Profile, or making all updates to a specific field be automatically changed to UPPERCASE to provide consistency in a collection.

Triggers provide a method for a database developer to have an automated set of code that can be executed based on the incoming DML statements or other events.

Database triggers are applied to a database collection or table using either the database UI or executing code. Other types of triggers are based on scheduled time or authentication events.

Yes, MongoDB Atlas provides extensive functionality through the use of triggers. More about MongoDB triggers can be found in the documentation: https://www.mongodb.com/docs/atlas/atlas-ui/triggers/

Database triggers can be good or bad. They should be used with caution since they can mess with critical logic which can create an illusion of automatic processes.

A database with too many triggers can cause events to slow down and generate excess latency to your operations.

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What are Database Triggers?

FAQ

What are triggers in a database?

What are the types of triggers?

Where are database triggers stored?

What is an example of a database trigger?

What is the main purpose of triggers in a database?

How do I apply database triggers?

Does MongoDB have triggers?

Are database triggers bad?

Do triggers slow down a database?

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