The U.K.’s Ministry of Justice boosts database performance and strengthens security of National Offender Database by moving to Oracle Database 11g.
Read more about how they did it and why they did it in the success story:
http://www.ukocn.com/files/case-studies/Ministry%20Of%20Justice%2011g%20Upgrade%20and%20Options%20Case%20Study.pdf
You can do it as well 🙂