Linux Server - How to configure VNC server to load up the complete GNOME desktop and auto startup after server power on

[root@testdb4 ~]# chkconfig vncserver on --level 5
[root@testdb4 ~]# chkconfig --list|grep vnc
vncserver       0:off   1:off   2:off   3:off   4:off   5:on    6:off

[oracle@testdb4 .vnc]$ pwd
/home/oracle/.vnc
[oracle@testdb4 .vnc]$ cat xstartup
#!/bin/sh

# Uncomment the following two lines for normal desktop:
 unset SESSION_MANAGER
 exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
twm &
#gnome-session &

[root@testdb4 rc5.d]# more /etc/sysconfig/vncservers
# The VNCSERVERS variable is a list of display:user pairs.
#
# Uncomment the lines below to start a VNC server on display :2
# as my 'myusername' (adjust this to your own).  You will also
# need to set a VNC password; run 'man vncpasswd' to see how
# to do that.
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted!  For a secure way of using VNC, see
# <URL:http://www.uk.research.att.com/archive/vnc/sshvnc.html>.

# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.

# Use "-nohttpd" to prevent web-based VNC clients connecting.

# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel.  See the "-via" option in the
# `man vncviewer' manual page.

# VNCSERVERS="2:myusername"
# VNCSERVERARGS[2]="-geometry 800x600 -nolisten tcp -nohttpd -localhost"

 VNCSERVERS="2:oracle"
 VNCSERVERARGS[2]="-geometry 1024x768 -nohttpd -nolisten tcp"