HELP! Mysql isn’t working [dreamhost]

I just got a new domain hosted by Dreamhost. The mysql here is weird.. and I just can’t get it to work! It says that i can’t use localhost and that i have to use mysql.mydomain.com. I did.

define(‘wordpress’, ‘wp’); // The name of the database
define(‘DB_USER’, ‘trangy’); // Your MySQL username
define(‘DB_PASSWORD’, ‘mypassword’); // …and password
define(‘DB_HOST’, ‘mysql.msdyearbook.com’); // 99% chance you won’t need to change this value

But then when I go to the install page, it says:
We were able to connect to the database server (which means your username and password is okay) but not able to select the DB_NAME database.

What’s wrong with the database name. I’ve tried aerie (which is my root home thing.. like home/aerie or whatever, i forgot what that’s called..) and did aerie_wp but that didn’t work either.
Please help! Thanks.