I wouldn't call knowledge of V$ views 'internals'. You can read that online in the reference manual. - Knowing why the V$ views are there and understanding the meaning of the fields in detail - yes. - Being able to understand and read contents of Session Trace files - yes. - Knowing how consistent reads, undo and redo work - yes (light weight). - Being able to recognize the subsystems from the function name when you get an ORA-00600 - yes And performing a colonoscopy using dtrace or odb - definitely /Hans On 13/03/2013 12:14 PM, Vasu wrote: > I see the term "Oracle Internals" used in some of the Oracle-DBA job > postings , not sure what they mean by that. > I "guess", by internals they mean , knowledge of few more v$ tables , > session trace & troubleshooting . > -- //www.freelists.org/webpage/oracle-l