There is one thing that strikes me in the Sun MySQL thingy - what about Sun’s previous commitment to PostgreSQL, where they say stuff like: “PostgreSQL for Solaris 10 is the open source enterprise database platform of choice”?
Tim Bray comments on the deal and totally dismisses any alternatives:
MySQL, you know, in my experience, it, well, Just Works. Runs great on our hardware and OS. Well, OK, GNU/Linux too. What else is there? For databases, nothing that matters.
I strongly prefer PostgreSQL over MySQL, and I have previously used Sun as a reference for it. Perhaps no more.