Oracle Principal Member Technical Staff interview questions

Interview process moved very fast as they had urgent openings, was for one of the teams in Enterprise Manager group. Since I was locally based, the first round was a 1:1 technical interview with Manager on-site. After clearing that, was called for an onsite interview which went on for 5-hours with about 7 interviewers(30-45 min) including VP of the group. Did not ask to do much coding during the interviews, was mostly design oriented and technical problem solving. Whiteboard usage was required, so prospective candidates, should practice standard class diagram representations and in-depth knowledge of architectures. Interviewers seemed nice and friendly, although work culture looked very formal and not so much fun, but its only a perception. Office is in a very good location and they seem to have great facilities.