4
Not that I am aware of - generally database upgrades are so big that it was only done in the beginning. I see that there are update scripts from 2.0.0 to 2.0.1 but none since then that involved database changes. The update from 2.0.6 to 2.0.7 had an update script to update the mainfile.php, but if you do that manually, you should be fine.