Installing the Gnome desktop and vncserver
From MyWiki
yum groupinstall Desktop
yum install gnome-core xfce4 firefox
yum install tigervnc-server
chkconfig vncserver on
As the user(oracle) run vncpasswd
vi /etc/sysconfig/vncservers
[...]
VNCSERVERS="1:srijan"
VNCSERVERARGS[1]="-geometry 1024x768"
service vncserver restart