="indexterm"></a>
       </span> <a href="#GUC-VACUUM-COST-PAGE-MISS" class="id_link">#</a></dt><dd><p>
         The estimated cost for vacuuming a buffer that has to be read from
         disk.  This represents the effort to lock the buffer pool,
         lookup the shared hash table, read the desired block in from
         the disk and scan its content. The default value is 2.
        </p></dd><dt id="GUC-VACUUM-COST-PAGE-DIRTY"><span class="term"><code class="varname">vacuum_cost_page_dirty</code> (<code