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<title>Berkeley DB Reference Guide: Release 3.0: upgrade requirements</title>
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<td><b><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></b></td>
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<p align=center><b>Release 3.0: upgrade requirements</b></p>
<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_c/db_open.html">DB-&gt;open</a> method will return a <a href="../../api_c/db_open.html#DB_OLD_VERSION">DB_OLD_VERSION</a>
error.</p>
<p>For further information on upgrading Berkeley DB installations, see
<a href="../../ref/upgrade/process.html">Upgrading Berkeley DB
installations</a>.</p>
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