BeOS did the whole "filesystem is a database" thing that was pretty cool[0].
I think AS/400 does a similar thing, but I don't know a lot about it. PICK OS was also similar.
I think AS/400 does a similar thing, but I don't know a lot about it. PICK OS was also similar.
BeOS feels more like a document database - no defined schema, just attributes attached to your files.
I recall installing the WinFS beta 1 release and suddenly the winfs-related background processes were eating up 150MB+ of RAM at a minimum, even with no stores created or files indexed - when machines back in 2005 had 512MB of memory that's actually a lot for what is supposed to be a background service.
Windows XP back then only needed 128MB of ram to run. they made a mistake in not building it on top of something akin to sqlite - hell they could've implemented maybe 70% of what they shipped in beta 1 with just sqlite alone.