Are there more study resources (other than official Oracle book and Oracle Certification Prep summary) in pipeline or on market?The Oracle Press series isn't really 'from' Oracle, but rather is from McGraw Hill, so 'official' is a strong word to use. I know that Oracle provides some materials to the authors, but not the extent or type. There are very few authors/publishers that compete with Oracle Press in writing Oracle certification books. The three tests required for the DBA OCP (SQL, DBA1, DBA2) will normally generate competing books from Sybex and sometimes Packt. Beyond those tests, however, unless Oracle Press writes a certification guide, normally no one else does (and if Oracle Press writes a guide, then especially no one else does). This lack of certification materials for Oracle tests is a large portion of the reason I started writing my guides. Even then, one of the primary reasons why I designed them as a series of study guides rather than full-blown soup-to-nuts manuals is to avoid 'competing' with Oracle Press. I'd lose that fight, so I avoid it.