Yes I agree, that assertion doesn't pass muster.
Mature database implementations also bypass a lot of kernel machinary to get closer to the underlying block devices. The layering of DB on top of FS is a failure.
Mature database implementations also bypass a lot of kernel machinary to get closer to the underlying block devices. The layering of DB on top of FS is a failure.
Common usage does this by convention, but that's just sloppy thinking and populist extentional definitining. I posit that any rigorous, thought-out, not overfit intentional definition of a database will, as a matter of course, also include file systems.