So <code class="literal">.example.com</code> would match
       <code class="literal">foo.example.com</code> (but not just
       <code class="literal">example.com</code>).
      </p><p>
       When host names are specified
       in <code class="filename">pg_hba.conf</code>, you should make sure that
       name resolution is reasonably fast.  It can be of advantage to
       set up a local name resolution cache such
       as <code class="command">nscd</code>.  Also, you may wish to enable the
       conf