he
      counter and continue execution.
     </p><p>
      The intent of this feature is to allow administrators to reduce
      the I/O impact of these commands on concurrent database
      activity. There are many situations where it is not
      important that maintenance commands like
      <code class="command">VACUUM</code> and <code class="command">ANALYZE</code> finish
      quickly; however, it is usually very important that these
      commands do not significantly interfere with the ability of t