nd items are now stored in sorted order.
<span class="emphasis"><em>The format changes are entirely backward-compatible, and no database
upgrades are needed.</em></span>
However, upgrading existing databases can offer significant performance
improvements. Note that databases created using the 4.6 release may not
be usable with earlier Berkeley DB releases.</li>
          </ol>
        </div>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
      