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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Stop Auto-Initialization</title>
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
<link rel="home" href="index.html" title="Getting Started with Replicated Berkeley DB Applications" />
<link rel="up" href="addfeatures.html" title="Chapter 5. Additional Features" />
<link rel="previous" href="manageblock.html" title="Managing Blocking Operations" />
<link rel="next" href="c2ctransfer.html" title="Client to Client Transfer" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">Stop Auto-Initialization</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="manageblock.html">Prev</a> </td>
<th width="60%" align="center">Chapter 5. Additional Features</th>
<td width="20%" align="right"> <a accesskey="n" href="c2ctransfer.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="noautoinit"></a>Stop Auto-Initialization</h2>
</div>
</div>
<div></div>
</div>
<p>
As stated in the previous section, when a replication replica is synchronizing
with its master, it will block all DB operations until the synchronization
is completed. You can turn off this behavior (see <a href="manageblock.html">Managing Blocking Operations</a>), but for replicas that have been out of touch
from their master for a very long time, this may not be enough.
</p>
<p>
If a replica has been out of touch from its master long enough, it may find that
it is not possible to perform synchronization. When this happens, by default the
master and replica internally decided to completely re-initialize the replica.
This re-initialization involves discarding the replica's current database(s) and
transferring new ones to it from the master. Depending on the size of the master's
databases, this can take a long time, during which time the replica will be
complete non-responsive when it comes to performing database operations.
</p>
<p>
It is possible that there is a time of the day when it is better to perform a replica
re-initialization. Or, you simply might want to decide to bring the replica up to
speed by restoring it's databases using a hot-backup taken from the master. Either
way, you can decide to prevent automatic-initialization of your replica. To do this
specify
<span>
<tt class="literal">DB_REP_CONF_NOAUTOINIT</tt> to
<tt class="methodname">DB_ENV-&gt;rep_set_config()</tt>
and then specify <tt class="literal">1</tt> to the <tt class="literal">onoff</tt>
parameter. (Specify <tt class="literal">0</tt> to turn the feature off.)
</span>
</p>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="manageblock.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="addfeatures.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="c2ctransfer.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Managing Blocking Operations </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Client to Client Transfer</td>
</tr>
</table>
</div>
</body>
</html>