In particular there is nothing on the OCP DBA Track. Oradev is for developers only. Use the menu on the left to navigate the site. If you are not already familiar with the OCP Program then I suggest you start at the top and work your way down. Preparation re-states Oracle's view of the prepartion you need to undertake to pass the Developer Track and gives my comments on it.
Resources is the core of the site.
This is a distillation of information that you need to know to pass the OCP Developer Track Links does what it say on the tin. Please mail comments and suggestions to the Webmaster with 'Feedback' in the subject.