he
      system to perform other database operations. Cost-based vacuum
      delay provides a way for administrators to achieve this.
     </p><p>
      This feature is disabled by default for manually issued
      <code class="command">VACUUM</code> commands. To enable it, set the
      <code class="varname">vacuum_cost_delay</code> variable to a nonzero
      value.
     </p><div class="variablelist"><dl class="variablelist"><dt id="GUC-VACUUM-COST-DELAY"><span class="term"><code class="varname">vacuum_c