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<!--$Id: disk.so,v 1.9 2000/12/21 18:37:09 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: Release 3.1: upgrade requirements</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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<body bgcolor=white>
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<table><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></h3></td>
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<td width="1%"><a href="../../ref/upgrade.3.1/logalloc.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/upgrade.3.2/intro.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>Release 3.1: upgrade requirements</h1>
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<p>Log file formats and the Btree, Queue, Recno and Hash Access Method
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database formats changed in the Berkeley DB 3.1 release. (The on-disk
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Btree/Recno format changed from version 7 to version 8. The on-disk
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Hash format changed from version 6 to version 7. The on-disk Queue
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format changed from version 1 to version 2.) Until the underlying
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databases are upgraded, the <a href="../../api_c/db_open.html">DB->open</a> function will return a
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<a href="../../api_c/db_open.html#DB_OLD_VERSION">DB_OLD_VERSION</a> error.
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<p>An additional flag, <a href="../../api_c/db_set_flags.html#DB_DUPSORT">DB_DUPSORT</a>, has been added to the
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<a href="../../api_c/db_upgrade.html">DB->upgrade</a> function for this upgrade. Please review the
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<a href="../../api_c/db_upgrade.html">DB->upgrade</a> documentation for further information.
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<p>For further information on upgrading Berkeley DB installations, see
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<a href="../../ref/upgrade/process.html">Upgrading Berkeley DB
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installations</a>.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/upgrade.3.1/logalloc.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/upgrade.3.2/intro.html"><img src="../../images/next.gif" alt="Next"></a>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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