The first step is to make sure your boss, and everyone else, knows who you are, what you are there for, and to find out from them what they expect/want from you. Get yourself known, and make sure you know them as well. This doesn't have to be some kind of over-social, "I like bicycles and kittens and chess" type thing. It needs to be, "My name is Bob, and I'm the new database developer. I'm really good at writing SQL queries, and am interested in expanding into database administration. What do you need and want for me to be a fully functional team member?" (Of course, don't just copy that. Needs to be written from your situation.)