Hi people.
I'm a junior DBA and interested in the OCP program.
What books would you suggest for studying?

I found two collections and please I would like your feedback of those.

1) 3 books published by Sybex
- one that cover SQL and PL/SQL
- one that cover Tuning and Network Admin
- and one for Architecture/Admin and Backup/Recovery

2) A book published by Osborne (Oracle Press)
- ...DBA Certification Exam Guide (cover all 5 exams)


Thanks in advance.