I was kind of rusty in the interview process, therefore, my nerves were a little on edge and when that happens you tend to freeze a bit and your thought process is hindered. Many times you know the answer to the questions, however, you have "stage panic" if you would and the answers don't come to you as they should. But the most difficult question has been regarding updates of transactions to a database, "how many of those transactions would be available in a database after a rollback statement".