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104 lines
5.1 KiB
HTML
104 lines
5.1 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>Initializing a new site</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="rep.html" title="Chapter 12. Berkeley DB Replication" />
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<link rel="prev" href="rep_mastersync.html" title="Synchronizing with a master" />
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<link rel="next" href="rep_bulk.html" title="Bulk transfer" />
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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 11.2.5.2</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">Initializing a new site</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="rep_mastersync.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12.
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Berkeley DB Replication
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="rep_bulk.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="rep_init"></a>Initializing a new site</h2>
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</div>
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</div>
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</div>
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<p>By default, adding a new site to a replication group only requires the
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client to join. Berkeley DB will automatically perform internal
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initialization from the master to the client, bringing the client into
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sync with the master.</p>
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<p>
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However, depending on the network and infrastructure, it can be
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advantageous in a few instances to use a "hot backup" to initialize a
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client into a replication group. Clients not wanting to automatically
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perform internal initialization should call the <a href="../api_reference/C/repconfig.html" class="olink">DB_ENV->rep_set_config()</a> method to
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turn off the <a href="../api_reference/C/repconfig.html#config_DB_REP_CONF_AUTOINIT" class="olink">DB_REP_CONF_AUTOINIT</a> flag. Turning off this
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configuration flag causes Berkeley DB to
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return <a href="../api_reference/C/repmessage.html#repmsg_DB_REP_JOIN_FAILURE" class="olink">DB_REP_JOIN_FAILURE</a> to the application's <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method instead of
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performing internal initialization.
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</p>
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<p>To use a hot backup to initialize a client into a replication group,
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perform the following steps:</p>
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<div class="orderedlist">
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<ol type="1">
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<li>Do an archival backup of the master's environment, as described in
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<a class="xref" href="transapp_archival.html" title="Database and log file archival">Database and log file archival</a>. The backup can either be a conventional backup or a hot
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backup.</li>
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<li>Copy the archival backup into a clean environment directory on the
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client.</li>
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<li>Run catastrophic recovery on the client's new environment, as described
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in <a class="xref" href="transapp_recovery.html" title="Recovery procedures">Recovery procedures</a>.</li>
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<li>Reconfigure and reopen the environment as a client member of the
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replication group.</li>
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</ol>
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</div>
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<p>If copying the backup to the client takes a long time relative to the
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frequency with which log files are reclaimed using the
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<a href="../api_reference/C/db_archive.html" class="olink">db_archive</a> utility or the <a href="../api_reference/C/logarchive.html" class="olink">DB_ENV->log_archive()</a> method, it may be
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necessary to suppress log reclamation until the newly restarted client
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has "caught up" and applied all log records generated during its
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downtime.</p>
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<p>As with any Berkeley DB application, the database environment must be in a
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consistent state at application startup. This is most easily assured
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by running recovery at startup time in one thread or process; it is
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harmless to do this on both clients and masters even when not strictly
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necessary.</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="rep_mastersync.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="rep.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="rep_bulk.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">Synchronizing with a master </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"> Bulk transfer</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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