-compatible, and no database upgrades are needed.</strong></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.</p>
      <p>For further information on upgrading Berkeley DB installations, see
<a class="xref" href="upgrade_process.html" title="Chapter 2.  Upgrading from previous versions of Berkeley DB">
		Upgrading from previous versions of Berkeley DB
        </