title: Is a pg_dump DB dump 'at-that-time' dump?
body: <p>I know PostgresQL <code>pg_dump</code> guarantees consistency even if DB is modified while dump is going on, but I want to know if the final dump contains any data modified/inserted after the dump started.</p>
  
  <p>To elaborate:</p>
  
  <ol>
  <li>Time <em>t</em>:     I start pg_dump</li>
  <li>Time <em>t+1</em>:  There are updates/inserts to the database</li>
  <li>Time <em>t+x</em>:  pg_dump completes.</li>
  </ol>
  
  <p>I don't want any of the modifications done in the 'x' period to be present in the dump file.</p>
  
  <p>Is this possible?</p>