Ron Rennick on "[Plugin: SharDB] Migrate Sites"

If WP cannot select the database but the database exists then the WP DB_USER does not have permissions to access the database.

VIP databases:

- you have to create these & migrate the sites tables to them before you can use them
- they have to follow the naming convention of {$shardb_prefix}{NAME}
- configure in db-settings (at the bottom) add_vip_blog( {blog_id}, {NAME} );