Database as Filesystem [video]
This was the idea behind murdererfs, right?  It worked pretty well to power mp3.com for a few years.The great https://philip.greenspun.com/panda/databases-choosing talks a bit about the issue:The great thing about the file system is its invisibility. You probably didn't purchase it separately, you might not be aware of its existence, you won't have to run an ad in the newspaper for a file system administrator with 5+ years of experience, and it will pretty much work as advertised. All you need to do with a file system is back it up to tape every day or two.He goes on to say that the main thing RDBMSes add to your web-serving life is ACID transactions, which I think is pretty much true.  Sadly modern filesystems still don't support ACID transactions, though often they do manage to export sufficient functionality for user-level code like Postgres and SQLite to do so.