The compact command returns free space back to the OS. While it's successful in achieving that, it's usefulness is limited to situations where free space exists and isn't likely to be reused (e.g., bulk delete and right-size or archiving). It isn't intended to handle situations where space is amplified due to usage patterns resulting in a poor on-disk layout.

The moveCollection command rewrites the file which would correct these situations. We should consider aliasing (e.g., rewriteCollection) the command for this use case.