What is the main function of a Teradata trigger?

The primary function of a Teradata trigger is to execute predefined actions based on database events. Triggers are special database objects that automatically execute or fire when certain events occur in the database, such as inserting, updating, or deleting records in a table. This capability allows for the enforcement of business rules, auditing changes, and maintaining data integrity without requiring explicit application code.

By configuring triggers, you can ensure that specific actions occur automatically in response to changes in the data. For instance, a trigger could be set to log changes to another table every time a record is updated, which helps in tracking historical changes and modifications to the data.

In terms of other options: enhancing data processing speed, managing user access rights, and optimizing data storage are not functions served by triggers. These concerns are typically handled through different means within the database system, such as query optimization, security features, and data management strategies.