Which tool does Delta Lake use to manage data files?

Delta Lake uses the VACUUM command to manage data files. The VACUUM operation is essential in Delta Lake for optimizing storage by removing files that are no longer referenced in the Delta table's transaction log. This helps in reclaiming storage space by deleting old versions of data that are beyond a specified retention period.

When Delta Lake maintains its transaction log, it keeps track of all changes made to the data. As data gets updated or deleted, older versions of the data files accumulate and can lead to increased storage usage. By executing the VACUUM command, users can clean up these obsolete files safely, ensuring that they are removed only after a defined retention period has passed.

While other options like GRANT, COMMIT, and RENAME might relate to various functionalities in SQL and data management, they do not have the specific role in managing data files within Delta Lake that VACUUM does. Each of those commands serves different purposes, such as controlling access, finalizing transactions, or modifying object names, but they do not directly address the file management aspect that VACUUM handles.