From blocking it from the internet, you need to isolate your internal network from outside using firewalls so that only ports that needs to be opened are kept open and only to specific hosts within a DMZ area. Rest of your internal network should be totally isolated from outside world.
Within your network, there are many ways to protect your database. Check the oracle's website for all the products offered. Each product is designed to address specific security issues. Devise a good security practice for all your databases. Please refer to the metalink note 207959.1 which gives a very good overview on all available security features for your oracle databases.
http://www.oracle.com/us/technologies/security/security-solutions-151411.html
Within your network, there are many ways to protect your database. Check the oracle's website for all the products offered. Each product is designed to address specific security issues. Devise a good security practice for all your databases. Please refer to the metalink note 207959.1 which gives a very good overview on all available security features for your oracle databases.
http://www.oracle.com/us/technologies/security/security-solutions-151411.html
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