What is an "Event Handler" in a DTS package?

An Event Handler in a DTS (Data Transformation Services) package is a component that triggers specific actions during the execution of the package. When certain events occur—such as the completion of a task, a failure, or warnings—the Event Handler allows developers to define custom responses to those events. For example, if a data loading task fails, an Event Handler can be set up to send an email notification, log the error, or perform any other necessary actions to handle the situation appropriately.

This ability to customize behavior based on runtime events is crucial for ensuring robust data processing and handling unexpected situations effectively. The other options describe functionalities that do not encapsulate the primary role of an Event Handler: they either address performance monitoring, error reporting, or data validation, which are not the main functions of an Event Handler within a DTS package.