Counterexamples: Running your DB with the default parameters. Not running Linux kernel parameters depending on your workload. (+10Gbit NICs, lots of connectio

Counterexamples: Running your DB with the default parameters. Not running Linux kernel parameters depending on your workload. (+10Gbit NICs, lots of connections...) There are reasons, why those knobs are there, as there are always trade-off, and having them automatically adjust is very hard. But maybe that was what you're referring to.