disk that will be used to back
                 the database.
            </p>
            <p>
                An in-memory database never intended to be preserved on
                disk may be created by not specifying a file name. For
                example:
            </p>
            <pre class="programlisting">berkdb open -create -btree  </pre>
            <p>
                creates an in-memory database.
            </p>
          </li>
          <li>
            <p>
                  <span class=