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94 lines
4.6 KiB
HTML
94 lines
4.6 KiB
HTML
<?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>Stop Auto-Initialization</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 Replicated Berkeley DB Applications" />
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<link rel="up" href="addfeatures.html" title="Chapter 5. Additional Features" />
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<link rel="prev" href="manageblock.html" title="Managing Blocking Operations" />
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<link rel="next" href="rywc.html" title="Read-Your-Writes Consistency" />
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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 11.2.5.3</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">Stop Auto-Initialization</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="manageblock.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5. Additional Features</th>
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<td width="20%" align="right"> <a accesskey="n" href="rywc.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="autoinit"></a>Stop Auto-Initialization</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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As stated in the previous section, when a replication
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replica is synchronizing with its master, it will block
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DB operations at some points during this process
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until the synchronization is completed. You can turn
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off this behavior (see <a class="xref" href="manageblock.html" title="Managing Blocking Operations">Managing Blocking Operations</a>), but for replicas
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that have been out of touch from their master for a
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very long time, this may not be enough.
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</p>
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<p>
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If a replica has been out of touch from its master long enough, it may find that
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it is not possible to perform synchronization. When this happens, by default the
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master and replica internally decide to completely re-initialize the replica.
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This re-initialization involves discarding the replica's current database(s) and
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transferring new ones to it from the master. Depending on the size of the master's
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databases, this can take a long time, during which time the replica will be
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completely non-responsive when it comes to performing database operations.
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</p>
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<p>
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It is possible that there is a time of the day when it is better to perform a replica
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re-initialization. Or, you simply might want to decide to bring the replica up to
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speed by restoring its databases using a hot-backup taken from the master. Either
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way, you can decide to prevent automatic-initialization of your replica. To do this
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specify
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<span>
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<code class="literal">DB_REP_CONF_AUTOINIT</code> to
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<code class="methodname">DB_ENV->rep_set_config()</code>
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and then specify <code class="literal">0</code> to the <code class="literal">onoff</code>
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parameter.
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</span>
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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="manageblock.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="addfeatures.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="rywc.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">Managing Blocking Operations </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"> Read-Your-Writes Consistency</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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