title: How to know whether the created view is valid or not
body: <p>I am new to db.</p>
  <p>Lets say I have created a view with force.</p>
  <p>So how can I get know whether the view created is invalid or not?</p>
  <p>I mean are there any queries from which I can get to know the validity status of the view?</p>
  <p>Thanks.</p>