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you can write a "cache that persists to disk" in a few lines of C code. ever hear of memory mapped files ?

That with a little bit of Fortran can get you in a big world of hurt.

I'm confused. You do realize that MongoDB uses memory mapped files for managing and interacting with all data...

Yes, I realize this. My point is that it's not a "technical niche", it's something nearly anyone can do, and has been able to do, for decades.