I needed to uninstall Oracle database 184.108.40.206.0 from a windows host and came across something new to 11G R2.
I ran the Oracle Universal Installer (oui) and chose the “Deinstall” button, which is located where it’s always been. But instead of beginning the deinstallation set of screens, it just popped up a message box reading, “Please run the deinstall command $ORACLE_HOME/deinstall/deinstall.”
It turns out there is a new utility just for deinstallation. It is uniform across all Oracle platforms. The documentation details can be found here.
I was sufficiently surprised that I checked some 10.2.0 and 11.1.0 installations. They did not have the $ORACLE_HOME/deinstall directory, so it definitely is new for 11.2.0.