After chatting with Dotster tech support, I found that the databases are differently named. Dotster falls into the 1% of WordPress installs that has to change DB_HOST in wp-config.php to this:
define(‘DB_HOST’, ‘dbXXint.dotsterhost.com’); // 99% chance you won’t need to change this value
where the XX is a number.
Dotster users should use Control Panel and go to Hosting > Configuration & Administration > Web Space > Databases
look for the database you set up & replace “localhost” with the string coming after Internal hostname: which should look like the string above.
I’ll post a complete walkthrough for installing on Dotster, as I didn’t find one on Google & there is no FAQ help on Dotster.