Today I had to transfer a mysql db from an old host to a new host. I used to do this with phpmyadmin and export the db and hope that it would work properly on upload. I did a quick google search today and came up with the line:
$ mysqldump -u username -p'password' old-db | ssh firstname.lastname@example.org mysql -u username -p'password' new-db
It took about one minute to transfer about 400mb of information. I am sure that there are other ways to do this, but it just worked for me perfectly.