Upgrade Oracle Linux

Check version

$ cat /etc/oracle-release
Oracle Linux Server release 6.2 
$ lsb_release -d
Description:    Oracle Linux Server release 6.2

Perform upgrade

# cd /etc/yum.repos.d/
# mv public-yum-ol6.repo public-yum-ol6.repo.old
# wget http://public-yum.oracle.com/public-yum-ol6.repo
# yum upgrade