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 . On the other hand, "Internal" really means , something internal to Oracle Corp that they need not disclose . Long ago, I was trying to learn more about SCN.. and a blog told SCN-generation is internal to Oracle and is not available to public (and should not be hacked or so). Any ideas, when an Oracle DBA/Architect can say they know internals ?! :-) Thanks -Vasu -- //www.freelists.org/webpage/oracle-l