title: where views are stored in Mysql
body: <p>I have some questions on views - </p>
  
  <ol>
  <li><p>Where views are created/stored in Mysql? Or they are only virtual and deleted after some time period?</p></li>
  <li><p>When the data of views is refresh? (It refresh automatically when we insert data in actual table or we have to update view each time?)</p></li>
  <li><p>Use of views is good or we should fire the queries each time?</p></li>
  </ol>