s only able
        to utilize up to a maximum of <code class="literal">1GB</code> of memory, so
        setting <code class="varname">autovacuum_work_mem</code> to a value higher than
        that has no effect on the number of dead tuples that autovacuum can
        collect while scanning a table.
       </p></dd><dt id="GUC-VACUUM-BUFFER-USAGE-LIMIT"><span class="term">
       <code class="varname">vacuum_buffer_usage_limit</code> (<code class="type">integer</code>)
       <a id="id-1.6.7.7.2.2.10.1.3" c