title: How to migrate core data by deleting old one on App Update
body: <p>Hi I'm going to update my iOS app in appstore and this update contains database change so now how to <strong>migrate my existing core data by deleting old database</strong> of existing version on App update? 
  I have referred <a href="http://www.raywenderlich.com/27657/how-to-perform-a-lightweight-core-data-migration" rel="nofollow noreferrer">Core Data Migration tutorial</a></p>
  
  <p><a href="https://stackoverflow.com/questions/5995231/example-or-explanation-of-core-data-migration-with-multiple-passes">Core Data Migration Post</a></p>
  
  <p>Unfortunately of no use. Any help is appreciated in advance</p>