In addition to everything else that has been mentioned in this thread, I would recommend that you study and be prepared to answer questions about best practices. There are best practices for virtually every aspect of DBA work so there is a lot to study.

In addition to being prepared to answer questions about/discuss best practices, I would also recommend that you interview your prospective employer. Unless you have no other options, you probably will not want to work for a prospective employer who has no interest in, no knowledge of, nor any commmitment to the implementation of best practices. To work in a "non-best practices" environment means constant firefighting, bandaiding, and generally reacting to problems rather than being a proactive DBA.

It's not much fun.

LC