We have all our sites on Dreamhost. When you create a database with them, the admin user you create with database has all of those permissions. (the admin user is the user you created when you set-up the database in the panel).
Just enter the user credentials that you created in the panel in the C5 installer and you should be good to go.
Alternately, as @MHo says, Dreamhost has a one-click Concrete5 install that will setup the database for you.
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