If you're talking database and not Oracle home, then I'd want to be sure that the 10g files are not now being used in your 11g database. We don't know enough from what you've given except to say "don't" until you're sure. Then simple erase of appropriate files or DBCA should do the trick. If you use ASM or RAC, I plead ignorance. If you're talking the 10g home, and nothing else uses the home (other databases, a listener), then I'd use OUI to remove it, so that the oraInventory is kept accurate Cheers, Wayne On Wed, Jun 25, 2014 at 12:34 PM, Zelli, Brian <Brian.Zelli@xxxxxxxxxxxxxxx> wrote , in part : > We installed 11g on our 10g production server. We are now running 11g. > Can I just delete the physical files from the 10g database? > > Would there be any reason to fire up 10g and drop it? Especially since we > won’t ever fire it up again? > > >