Dreamhost lets you use sub-domains on dreamhosters.com
First you will need to visit Manage Domains page of the panel and add a dreamhosters.com sub-domain there. (add it as fully hosted) try kabaddi.dreamhosters.com maybe that probably is not taken, or anything as long as it's not already used by another user. If your moving a domain eventually to dreamhost you might use your domain name like example_com.dreamhosters.com (which is the dreamhost suggested naming convention for sub-domains of dreamhosters.com).
Once the above is set up, go to goodies > mysql databases in the panel and add a hostname there. After the above entry is made you will be able to create mysql.example_com.dreamhosters.com or maybe you prefer db.example_com.dreamhosters.com whatever you like.