Reddit reviews Oracle Database 10g OCP Certification All-In-One Exam Guide (Oracle Database 10g Handbook)
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I myself have read this one while preparing for OCP certification.
http://www.amazon.com/Oracle-Database-Certification-All-In-One-Handbook/dp/0072257903/
Any OCA guide will give you necessary basics. Or you could read concepts from Oracle.
http://docs.oracle.com/cd/E11882_01/server.112/e40540.pdf
It's quite difficult to guess what can be asked in interview as there are tons of different things DBA can do.