title: Why not mongodb?
body: <p>I recently used MongoDB for the first time and found it exceptionally easy to use and high-performing. Which leads to my question - why not MongoDB?</p>
  
  <p>Lets say I am implementing a Q &amp; A app. My approach would be to implement the User data in a MySQL database and then use MongoDB for the question and answer storage - one collection storing a question and all responses. </p>
  
  <p>Is there anything wrong with this approach?</p>