How to change the database which is used to store liferay content?

I have a glassfish server built with company default script. Then I have Liferay installed upon it. Liferay uses some predefined database to store the content on the pages it shows. It is a company shared database don't know where. How could I connect my liferay to a local clean database?

My setup is a Gl开发者_如何学运维assfish with Liferay, the DatabaseI use is MySQL.

Thanks for any help!

It's all explained here:

http://www.liferay.com/community/wiki/-/wiki/Main/Database+Configuration