[munchler]

This makes me wonder whether there would be value in an OS that is also a DBMS (or vice versa). In other words, if the DBMS has total control over the hardware, perhaps performance can be maximized without too much additional complexity.

[matt_d]

One example is DBOS: A Database-oriented Operating System, https://dbos-project.github.io/ / https://github.com/DBOS-project (more details under "Publications").

[sedachv]

This is a bad idea from the 1960s: IBM TPF, MUMPS, Pick. As soon as the hardware changes it becomes slower and more complicated.

[yellowapple]

That was back when hardware was changing to a significant degree, though. Nowadays, there ain't really much that's new about hardware today v. hardware from 10 or 20 years ago - hence operating systems / filesystems being able to remain mostly stable instead of suffering from the exact same problem.