class="indexterm"></a>
      </span> <a href="#GUC-SHARED-MEMORY-TYPE" class="id_link">#</a></dt><dd><p>
        Specifies the shared memory implementation that the server
        should use for the main shared memory region that holds
        <span class="productname">PostgreSQL</span>'s shared buffers and other
        shared data.  Possible values are <code class="literal">mmap</code> (for
        anonymous shared memory allocated using <code class="function">mmap</code>),
        <code class="literal">s