mirror of
https://github.com/berkeleydb/je.git
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93 lines
4.3 KiB
HTML
93 lines
4.3 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>Running Backups</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 High Availability Applications" />
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<link rel="up" href="administration.html" title="Chapter 7. Administration" />
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<link rel="prev" href="nodeconfig.html" title="Node Configuration" />
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<link rel="next" href="addremovenodes.html" title="Adding and Removing Nodes" />
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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">Running Backups</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="nodeconfig.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7. Administration</th>
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<td width="20%" align="right"> <a accesskey="n" href="addremovenodes.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="backups"></a>Running Backups</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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Because JE replication causes a current copy of your
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environment to be available at every data node in the group, the need
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for frequent backups is greatly reduced. Basically, every time a
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change is made on the Master, that change is backed up to every
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Replica node currently running. The result is that for each write
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operation you get a real-time incremental backup to
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<span class="emphasis"><em>n-1</em></span> nodes, where <span class="emphasis"><em>n</em></span> are
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the total number of data nodes (including the Master) currently
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running in your replication group.
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</p>
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<p>
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For this reason, JE does not currently support formal
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incremental backups of replicated environments. An application
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based upon the <a class="ulink" href="../java/com/sleepycat/je/util/DbBackup.html" target="_top">DbBackup</a> utility class can be written to allow
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administrators to create full backups. This is useful for
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creating a backup to be stored on offline media, if your data
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strategy calls for that level of protection.
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</p>
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<p>
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Remember that when performing a full backup, you should obtain
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the backup from a node that is current. Either use the Master
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node itself, or use a Replica node that must acknowledge a
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transaction commit before the commit operation can complete on
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the Master.
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</p>
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<p>
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Note that <a class="ulink" href="../java/com/sleepycat/je/util/DbBackup.html" target="_top">DbBackup</a> has some functionality that
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is specifically useful for replicated environments. See
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<a class="xref" href="dbbackup.html" title="Backing up a Replicated Application">Backing up a Replicated Application</a>
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for details.
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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="nodeconfig.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="administration.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="addremovenodes.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">Node Configuration </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"> Adding and Removing Nodes</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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