[Kesty]

Yes, ok I agree. 100% agree.

But micro optimization has always the same caveat:

Of course it is not irrelevant, it might even be very important, in very specific cases.

But if you are not one of those cases (and you should already know if you are) you shouldn't even bother with it.

[Jweb_Guru]

I think that everything you just said categorizes VoltDB already, though. They're not advertising themselves as a general purpose database. You'll know if you have a use case for it.