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104 lines
5 KiB
HTML
104 lines
5 KiB
HTML
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<?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>JE Backup and Restore</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="Getting Started with Berkeley DB Java Edition" />
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<link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB Java Edition" />
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<link rel="prev" href="applicationoverview.html" title="The JE Application" />
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<link rel="next" href="jca.html" title="JCA Support" />
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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 12.2.7.5</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">JE Backup and Restore</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="applicationoverview.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 1. Introduction to Berkeley DB Java Edition </th>
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<td width="20%" align="right"> <a accesskey="n" href="jca.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="restore"></a>JE Backup and Restore</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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To backup your database, copy the log files (the
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<code class="literal">.jdb</code> files) starting from the lowest
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numbered log file to the highest numbered log file to your
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backup media. Be sure to copy the bytes of the individual
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database files in order from the lowest to the highest. You do
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not have to close your database or otherwise cease database
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operations when you do this.
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</p>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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Note that if you are using subdirectories to store your log
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files, then you should copy those subdirectories and their
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contents instead of simply copying individual files.
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Multiple subdirectories can be used to improve JE
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throughput, but this feature is not turned on by default.
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See <a class="xref" href="env.html#multisubdir" title="Multiple Environment Subdirectories">Multiple Environment Subdirectories</a>
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for information on how to configure this feature.
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</p>
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</div>
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<p>
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Restoring a JE database from a backup consists of closing your
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JE environment, copying archived log files back into your
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environment directory and then opening your JE environment
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again. If you are using subdirectories to store your log files,
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then make sure to copy those subdirectories back into the
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environment home directory, and make sure the same log files are in
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each subdirectory as was there when you took the backup.
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</p>
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<p>
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Note that whenever a JE environment is opened, JE runs
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<span class="emphasis"><em>normal recovery</em></span>. This involves bringing your
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database into a consistent state given the changed data found in the
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database. If you are using transactions during normal operations, then
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JE automatically runs checkpoints for you so as to limit the time
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required to run this recovery. In any case, running normal recovery is a
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routine operation, while performing database restores is not.
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</p>
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<p>
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For more information on JE backup and restores, and on checkpoints, see
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<a class="xref" href="backuprestore.html" title="Chapter 11. Backing up and Restoring Berkeley DB Java Edition Applications">Backing up and Restoring Berkeley DB Java Edition Applications</a>.
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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="applicationoverview.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="introduction.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="jca.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">The JE Application </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"> JCA Support</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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