title: Does the amount of MySql users affect MySql performance much?
body: <p>When a user registers on my site, they have their own table created in one of my databases. This table stores all of the posts that the user makes.
  What I would also like to do is also generate them their own MySql user - which ONLY has permission to read, write and delete from their table.</p>
  
  <p>Creating that shouldn't be a problem - I've got Google for that.</p>
  
  <p>What I'm wondering is, let's imagine that I clock myself 10,000,000 or more users at one point in the future, would having that many MySql users affect my database performance?</p>