 title="ANALYZE"><span class="refentrytitle">ANALYZE</span></a>
      commands, the system maintains an
      internal counter that keeps track of the estimated cost of the
      various I/O operations that are performed.  When the accumulated
      cost reaches a limit (specified by
      <code class="varname">vacuum_cost_limit</code>), the process performing
      the operation will sleep for a short period of time, as specified by
      <code class="varname">vacuum_cost_delay</code>. Then it will reset t