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6<title>Berkeley DB Reference Guide: Release 3.1: upgrade requirements</title>
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12<td><b><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></b></td>
13<td align=right><a href="/upgrade.3.1/logalloc.html"><img src="/images/prev.gif" alt="Prev"></a><a href="/toc.html"><img src="/images/ref.gif" alt="Ref"></a><a href="/upgrade.3.2/intro.html"><img src="/images/next.gif" alt="Next"></a>
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15<p align=center><b>Release 3.1: upgrade requirements</b></p>
16<p>Log file formats and the Btree, Queue, Recno and Hash Access Method
17database formats changed in the Berkeley DB 3.1 release.  (The on-disk
18Btree/Recno format changed from version 7 to version 8.  The on-disk
19Hash format changed from version 6 to version 7.  The on-disk Queue
20format changed from version 1 to version 2.)  Until the underlying
21databases are upgraded, the <a href="/api_c/db_open.html">DB-&gt;open</a> method will return a
22<a href="/api_c/db_open.html#DB_OLD_VERSION">DB_OLD_VERSION</a> error.</p>
23<p>An additional flag, <a href="/api_c/db_set_flags.html#DB_DUPSORT">DB_DUPSORT</a>, has been added to the
24<a href="/api_c/db_upgrade.html">DB-&gt;upgrade</a> method for this upgrade.   Please review the
25<a href="/api_c/db_upgrade.html">DB-&gt;upgrade</a> documentation for further information.</p>
26<p>For further information on upgrading Berkeley DB installations, see
27<a href="/ref/upgrade/process.html">Upgrading Berkeley DB
28installations</a>.</p>
29<table width="100%"><tr><td><br></td><td align=right><a href="/upgrade.3.1/logalloc.html"><img src="/images/prev.gif" alt="Prev"></a><a href="/toc.html"><img src="/images/ref.gif" alt="Ref"></a><a href="/upgrade.3.2/intro.html"><img src="/images/next.gif" alt="Next"></a>
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