Weekend Learning: Upgrading to Oracle Database 12c R1 using DB Upgrade Assistant

Of course I, and this blog, am focused on applications and Support/Operation of those applications, but sometimes we need to step into the shoes of our DBAs to learn something new which we can later apply to our discipline!  MOS document "Complete Checklist for Upgrading to Oracle Database 12c Release 1 using DBUA" is that kind of knowledge which you can find via article ID 1516557.1 to get some more details about files, objects, and other steps/scripts which you could find useful down the road!