I would say its less that you can’t or shouldn’t use mmap, and more that its not as simple as throwing mmap at it - if you care about crash recovery/not corrupt

I would say its less that you can’t or shouldn’t use mmap, and more that its not as simple as throwing mmap at it - if you care about crash recovery/not corrupting data (which most databases should care about), but that certainly doesn’t mean that mmap can’t be a part of the solution.