When Oracle Database 11.2 Release 2 was released, DBAs and developers were exposed to the following 18.104.22.168 new features. Most of the books that you see out there only focus on new features up to this point. Almost each year, Oracle released a new Patchset. Lot of folks are not aware that Oracle adds new features to each Patchset. Even with each PSU (Patchset updates), little features here and there are introduced. See below for the major enhancements that were released with the major Patchsets.