title: postgresql 9.5 how to update field on pg_settings table?
body: <p>I copy postgres database but forgot to set port then i tried to update pg_settings using : <br/> </p>
  
  <pre><code>update pg_settings set setting=5453 where name='port';
  </code></pre>
  
  <p>then i got : 
  
  <blockquote>
    <p>ERROR:  parameter "port" cannot be changed without restarting the server</p>
  </blockquote>
  
  <p>thanks</p>