Yum on virtual box Oracle Linux

[bjerkn]

Sorry in advance but I'm a complete noob in regards to virtualbox.
I've installed VB and installed a guest OS (Oracle Linux) and tried to install some packages with yum but it seems that it doesn't work:
[root@db01 ssh]# yum install xorg-x11-apps
Loaded plugins: security
Setting up Install Process
No package xorg-x11-apps available.
Error: Nothing to do

If I try something else like;
wget virtualbox website it works as intended.

So is there any way I can test that I actually have connection oracle repository?
Is there any special things I need to do in virtualbox to get yum started?
Thanks guys

[Perryg]

yum update should help to let you know. It all depends on whether or not you have enabled the public repo in OL

By the way yum is a package management feature of the OS and has nothing at all to do with VirtualBox