What does a precedence constraint do in a DTS package?

A precedence constraint in a DTS (Data Transformation Services) package is essential for orchestrating the flow of tasks within the package. It determines the sequence of task execution, meaning it specifies the order in which tasks are to be executed based on certain conditions or outcomes of previous tasks. This is crucial for ensuring that tasks that depend on the successful completion of prior tasks do not begin until those preceding tasks have been completed as expected.

For instance, if Task A must be completed before Task B can start, a precedence constraint will enforce this order. It ensures that if Task A fails, the continuation to Task B is appropriately halted, which can prevent errors and maintain the integrity of the data processing.

In contrast, other options refer to functionalities that are not related to how tasks are sequenced or dependent. While data storage locations and display settings are relevant aspects of a DTS package, they do not influence the execution order of the tasks. Similarly, creating backups of data is a separate operational concern that doesn't involve controlling the sequence of task operations within the package workflow.