What key feature does delta retrieval provide?

Delta retrieval is a feature that focuses on efficiency in data retrieval by allowing users to selectively pull data that meets certain conditions. This means that instead of retrieving all data elements from a data source, delta retrieval specifically targets data that has changed or meets predefined criteria, effectively minimizing the amount of data transferred and processed. This enhances performance and reduces unnecessary load on the system by allowing users to work only with the most relevant or significant data points.

In the context of the other options, while bulk data processing is advantageous, delta retrieval is specifically geared towards optimizing data collection rather than simply handling large quantities at once. Similarly, supporting only single value retrieval would limit the functionality of the system, while automating reporting tasks relates more to scheduling and generating reports rather than the core purpose of delta retrieval. Hence, the selective data collection attribute is what distinctly defines this feature.