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<p>Log file formats and the Btree, Recno and Hash Access Method database
formats changed in the Berkeley DB 3.0 release. (The on-disk Btree/Recno
format changed from version 6 to version 7. The on-disk Hash format
changed from version 5 to version 6.) Until the underlying databases
are upgraded, the <a href="../api_reference/C/dbopen.html" class="olink">DB->open()</a> method will return a <code class="literal">DB_OLD_VERSION</code>
error.</p>
<p>For further information on upgrading Berkeley DB installations, see
<a class="xref" href="upgrade_process.html" title="Upgrading Berkeley DB installations">Upgrading Berkeley DB installations</a>.</p>
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