Honestly I find it faster to import/export using a terminal and SFTP with Nautilus (but you could use whatever SFTP client)
so, assume my domain is: cheeseball.com and MySQL domain is: mysql.cheeseball.com
my SSH/FTP user is: cheese_admin
my database is named: cheese_db
my database user is: cheese_dbadmin
from terminal: ssh email@example.com
asks for password
connects, tells you some info...bla blah..
from terminal: mysql --user=cheese_dbadmin --password=yourpassword --host=mysql.cheeseball.com cheeseball_db < cheeseball.sql
now if you SFTP into your root folder you will see a file called cheeseball.sql , that is your dump, or export file
IMPORT::::(works exactly the same way)
from terminal: mysql --user=cheese_dbadmin --password=yourpassword --host=mysql.cheeseball.com cheeseball_db > cheeseball.sql
I also have a nice backup script that will backup all of your databases to the free 50gb storage that DreamHost gives you.