vacuum_cost_delay

doc html

<p>
         The amount of time that the process will sleep when the cost
         limit has been exceeded. If this value is specified without
         units, it is taken as milliseconds. The default value is
         <code class="literal">0</code>, which disables the cost-based vacuum delay
         feature.  Positive values enable cost-based vacuuming.
        </p><p>
         When using cost-based vacuuming, appropriate values for
         <code class="varname">vacuum_cost_delay</code> are usually quite small, perhaps
         less than 1 millisecond.  While <code class="varname">vacuum_cost_delay</code>
         can be set to fractional-millisecond values, such delays may not be
         measured accurately on older platforms.  On such platforms,
         increasing <code class="command">VACUUM</code>'s throttled resource consumption
         above what you get at 1ms will require changing the other vacuum cost
         parameters.  You should, nonetheless,
         keep <code class="varname">vacuum_cost_delay</code> as small as your platform
         will consistently measure; large delays are not helpful.
        </p>

documentation revision

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