You forgot to mention for which Oracle Linux distribution and kernel version.
Support for Wifi on a RHEL based server system is limited and often requires support by the vendor. Wireless is rather a desktop requirement for which other more suitable Linux distributions exist.
What is the output of lspci -v about your Wifi adapter?
Are you using the latest Oracle UEK kernel?
In a worse case scenario you may have to switch the supplied RHCK kernel and check http://elrepo.org/tiki/tiki-index.php which focuses on hardware related packages to enhance Enterprise Linux. Or, alternatively, which is usually a better option, install Oracle Linux inside VirtualBox.