89 lines
4.5 KiB
HTML
89 lines
4.5 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 V1.62.4" />
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<link rel="home" 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="previous" href="manageblock.html" title="Managing Blocking Operations" />
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<link rel="next" href="c2ctransfer.html" title="Client to Client Transfer" />
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</head>
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<body>
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<div class="navheader">
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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="c2ctransfer.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="noautoinit"></a>Stop Auto-Initialization</h2>
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</div>
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</div>
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<div></div>
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</div>
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<p>
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As stated in the previous section, when a replication replica is synchronizing
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with its master, it will block all DB operations until the synchronization
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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
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from their master for a 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 decided 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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complete 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 it's 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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<tt class="literal">DB_REP_CONF_NOAUTOINIT</tt> to
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<tt class="methodname">DB_ENV->rep_set_config()</tt>
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and then specify <tt class="literal">1</tt> to the <tt class="literal">onoff</tt>
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parameter. (Specify <tt class="literal">0</tt> to turn the feature off.)
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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="c2ctransfer.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"> Client to Client 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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