Well not to sound rude, but I wonder how you got the job in the first place. Most companies ask a lot of questions, but then again some dont. All I can say is learn, learn, and read, and read. Otherwise you will have big problems. I know 2 people who went right from school into a job both never working on servers before, and both got their MCSDBA but had never been in a prod environment, or designed anything.. Sadly both got fired very quickly, one because the previous DBA left the system in a bad state and they didnt have the background to keep up. And the second one because they made a stupid mistake. If you are the sole DBA then its a tough question, and there is no easy answer to prove to them. Just be careful because what you design for them now will stick with them for a long time and if its not right