@stefano After having migrated most of my FreeBSD servers to OpenBSD, I was still curious about Solaris. I noticed that OmniOS is a pretty interesting system for running a database server.
I have made a couple of notes on OmniOS for FreeBSD users: https://www.linuxquestions.org/questions/solaris-opensolaris-20/initial-omnios-impressions-by-a-bsd-user-4175626757/