The following parameters are available :

Databases
  The databases to which access is allowed. This can be an SQL regexp if desired.

Username
  The user allowed to access the above database. This user must already exist in the `User Permissions` table.

Hosts
  The hosts that the user can access the database from. If the option `From host permissions` is chosen, then MySQL should use the `Host Permissions` to control access.

Permissions
  The MySQL operations the user is allowed to perform on the database.