Regarding: Multiple database setup of 256 creating users

I am in the process of setting up the plugin for multiple databases.

I have created 256 and am cautiously walking through the setup.

I created a new user / password and am now trying to grant permissions for all 256 databases. I had to create a new user/password because I have no idea what was given at setup.

Is there now a way to add or grant permissions for this user to all 256 databases or do I still have to do each one manually. Can do that, but making sure it is the only way first.

Dedicated Server.

Thanks
Cheri