title: Postgres database dump size larger than physical size
body: <p>I just made an pg_dump backup from my database and its size is about 95GB but the size of the direcory /pgsql/data is about 38GB.</p>
  
  <p>I run a  vacuum FULL and the size of the dump does not change. The version of my postgres installation is 9.3.4, on a CentOS release 6.3 server.</p>
  
  <p>It is very weird the size of the dump comparing with the physical size or I can consider this normal?</p>
  
  <p>Thanks in advance!</p>
  
  <p>Regards.</p>
  
  <p>Neme.</p>