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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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    <title>Initializing a new site</title>
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    <link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
    <link rel="up" href="rep.html" title="Chapter 12.  Berkeley DB Replication" />
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        <tr>
          <th colspan="3" align="center">Initializing a new site</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="rep_mastersync.html">Prev</a> </td>
          <th width="60%" align="center">Chapter 12. 
		Berkeley DB Replication
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          <td width="20%" align="right"> <a accesskey="n" href="rep_bulk.html">Next</a></td>
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    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="rep_init"></a>Initializing a new site</h2>
          </div>
        </div>
      </div>
      <p>By default, adding a new site to a replication group only requires the
client to join.  Berkeley DB will automatically perform internal
initialization from the master to the client, bringing the client into
sync with the master.</p>
      <p>
    However, depending on the network and infrastructure, it can be
    advantageous in a few instances to use a "hot backup" to initialize a
    client into a replication group.  Clients not wanting to automatically
    perform internal initialization should call the <a href="../api_reference/C/repconfig.html" class="olink">DB_ENV-&gt;rep_set_config()</a> method with
    the <a href="../api_reference/C/repconfig.html#config_DB_REP_CONF_NOAUTOINIT" class="olink">DB_REP_CONF_NOAUTOINIT</a> flag.  This configuration flag causes Berkeley DB to
    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-&gt;rep_process_message()</a> method instead of
    performing internal initialization.

</p>
      <p>To use a hot backup to initialize a client into a replication group,
perform the following steps:</p>
      <div class="orderedlist">
        <ol type="1">
          <li>Do an archival backup of the master's environment, as described in
<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
backup.</li>
          <li>Copy the archival backup into a clean environment directory on the
client.</li>
          <li>Run catastrophic recovery on the client's new environment, as described
in <a class="xref" href="transapp_recovery.html" title="Recovery procedures">Recovery procedures</a>.</li>
          <li>Reconfigure and reopen the environment as a client member of the
replication group.</li>
        </ol>
      </div>
      <p>If copying the backup to the client takes a long time relative to the
frequency with which log files are reclaimed using the
<a href="../api_reference/C/db_archive.html" class="olink">db_archive utility</a> or the <a href="../api_reference/C/logarchive.html" class="olink">DB_ENV-&gt;log_archive()</a> method, it may be
necessary to suppress log reclamation until the newly restarted client
has "caught up" and applied all log records generated during its
downtime.</p>
      <p>As with any Berkeley DB application, the database environment must be in a
consistent state at application startup.  This is most easily assured
by running recovery at startup time in one thread or process; it is
harmless to do this on both clients and masters even when not strictly
necessary.</p>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="rep_mastersync.html">Prev</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="rep.html">Up</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="rep_bulk.html">Next</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">Synchronizing with a master </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">Home</a>
          </td>
          <td width="40%" align="right" valign="top"> Bulk transfer</td>
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