<!--$Id: disk.so,v 1.9 2000/12/21 18:37:09 bostic Exp $--><!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.--><!--All rights reserved.--><html><head><title>Berkeley DB Reference Guide: Release 3.1: upgrade requirements</title><metaname="description"content="Berkeley DB: An embedded database programmatic toolkit."><metaname="keywords"content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"></head><bodybgcolor=white><table><trvalign=top><td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></h3></td><tdwidth="1%"><ahref="../../ref/upgrade.3.1/logalloc.html"><imgsrc="../../images/prev.gif"alt="Prev"></a><ahref="../../ref/toc.html"><imgsrc="../../images/ref.gif"alt="Ref"></a><ahref="../../ref/upgrade.3.2/intro.html"><imgsrc="../../images/next.gif"alt="Next"></a></td></tr></table><p><h1align=center>Release 3.1: upgrade requirements</h1><p>Log file formats and the Btree, Queue, Recno and Hash Access Methoddatabase formats changed in the Berkeley DB 3.1 release. (The on-diskBtree/Recno format changed from version 7 to version 8. The on-diskHash format changed from version 6 to version 7. The on-disk Queueformat changed from version 1 to version 2.) Until the underlyingdatabases are upgraded, the <ahref="../../api_c/db_open.html">DB->open</a> function will return a<ahref="../../api_c/db_open.html#DB_OLD_VERSION">DB_OLD_VERSION</a> error.<p>An additional flag, <ahref="../../api_c/db_set_flags.html#DB_DUPSORT">DB_DUPSORT</a>, has been added to the<ahref="../../api_c/db_upgrade.html">DB->upgrade</a> function for this upgrade. Please review the<ahref="../../api_c/db_upgrade.html">DB->upgrade</a> documentation for further information.<p>For further information on upgrading Berkeley DB installations, see<ahref="../../ref/upgrade/process.html">Upgrading Berkeley DBinstallations</a>.<table><tr><td><br></td><tdwidth="1%"><ahref="../../ref/upgrade.3.1/logalloc.html"><imgsrc="../../images/prev.gif"alt="Prev"></a><ahref="../../ref/toc.html"><imgsrc="../../images/ref.gif"alt="Ref"></a><ahref="../../ref/upgrade.3.2/intro.html"><imgsrc="../../images/next.gif"alt="Next"></a></td></tr></table><p><fontsize=1><ahref="http://www.sleepycat.com">Copyright Sleepycat Software</a></font></body></html>
