DB Architecture, Performance tuning and different concepts related to it, Collections and collection methods, SQL loader techniques, Reference cursors, Pl/SQL programs and finding errors in programs are all some of the tricky questions that were asked apart from the basic textbook questions and syntaxes
Sigiloso
I answered them all as much as i could except for the Ref cursors and materialized views part where the interviewer kept asking for more and more details about it.