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97 lines
4.7 KiB
HTML
97 lines
4.7 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Database upgrade</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="am.html" title="Chapter 3. Access Method Operations" />
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<link rel="prev" href="am_truncate.html" title="Database truncation" />
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<link rel="next" href="am_verify.html" title="Database verification and salvage" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Database upgrade</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="am_truncate.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 3.
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Access Method Operations
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="am_verify.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="am_upgrade"></a>Database upgrade</h2>
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</div>
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</div>
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</div>
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<p>
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When upgrading to a new release of Berkeley DB, it may be necessary to
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upgrade the on-disk format of already-created database files.
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<span class="bold"><strong>Berkeley DB database upgrades are done in place,
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and so are potentially destructive.</strong></span> This means that if
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the system crashes during the upgrade
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procedure, or if the upgrade procedure runs out of disk space, the
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databases may be left in an inconsistent and unrecoverable state. To guard
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against failure, the procedures outlined in the <a href="../upgrading/upgrade_process.html" class="olink">Upgrading Berkeley DB installations</a> chapter of the
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Berkeley DB Installation and Build Guide should be carefully followed. If you are not performing
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catastrophic archival as part of your application upgrade process, you
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should at least copy your database to archival media, verify that your
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archival media is error-free and readable, and that copies of your backups
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are stored offsite!
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</p>
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<p>
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The actual database upgrade is done using the <a href="../api_reference/C/dbupgrade.html" class="olink">DB->upgrade()</a> method, or by
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dumping the database using the old version of the Berkeley DB software
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and reloading it using the current version.</p>
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<p>After an
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upgrade, Berkeley DB applications must be recompiled to use the new
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Berkeley DB library before they can access an upgraded database.
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<span class="bold"><strong>There is no guarantee that applications compiled
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against previous releases of Berkeley DB will work correctly with
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an upgraded database format. Nor is there any guarantee that
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applications compiled against
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newer releases of Berkeley DB will work correctly with the previous
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database format.</strong></span> We do guarantee that any archived database may
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be upgraded using a current Berkeley DB software release and the
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<a href="../api_reference/C/dbupgrade.html" class="olink">DB->upgrade()</a> method, and there is no need to step-wise upgrade the database
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using intermediate releases of Berkeley DB. Sites should consider
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archiving appropriate copies of their application or application sources if
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they may need to access archived databases without first upgrading them.
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</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="am_truncate.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="am.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="am_verify.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Database truncation </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Database verification and salvage</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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