So this new guy is basically just demonstrating that he's a good fit with what he understands to be the new regime. And unless you want to confront that regime head on, this is not a battle that you particularly want to take too far. Give 'em rope, let them demonstrate the "value" of the new approach on their own projects.

You can also axe the snide comment that I'd considered of telling him that you'd heard that MySQL does everything that Oracle does, and if you use MySQL then perhaps you don't need to bother with a DBA...

Cheers,
Ben