
      </span> <a href="#GUC-MAINTENANCE-WORK-MEM" class="id_link">#</a></dt><dd><p>
        Specifies the maximum amount of memory to be used by maintenance
        operations, such as <code class="command">VACUUM</code>, <code class="command">CREATE
        INDEX</code>, and <code class="command">ALTER TABLE ADD FOREIGN KEY</code>.
        If this value is specified without units, it is taken as kilobytes.
        It defaults
        to 64 megabytes (<code class="literal">64MB</code>).  Since only one of 