mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
93 lines
4.2 KiB
HTML
93 lines
4.2 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>Bulk transfer</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_init.html" title="Initializing a new site" />
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<link rel="next" href="rep_trans.html" title="Transactional guarantees" />
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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 18.1.40</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">Bulk transfer</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_init.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12. Berkeley DB Replication </th>
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<td width="20%" align="right"> <a accesskey="n" href="rep_trans.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_bulk"></a>Bulk transfer</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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Sites in a replication group may be configured to use bulk
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transfer by calling the <a href="../api_reference/C/repconfig.html" class="olink">DB_ENV->rep_set_config()</a> method with the
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<a href="../api_reference/C/repconfig.html#config_DB_REP_CONF_BULK" class="olink">DB_REP_CONF_BULK</a> flag. When configured for bulk transfer,
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sites will accumulate records in a buffer and transfer them to
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another site in a single network transfer. Configuring bulk
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transfer makes sense for master sites, of course.
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Additionally, applications using client-to-client
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synchronization may find it helpful to configure bulk transfer
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for client sites as well.
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</p>
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<p>
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When a master is generating new log records, or any
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information request is made of a master, and bulk transfer has
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been configured, records will accumulate in a bulk buffer. The
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bulk buffer will be sent to the client if either the buffer is
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full or if a permanent record (for example, a transaction
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commit or checkpoint record) is queued for the client.
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</p>
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<p>
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When a client is responding to another client's request for
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information, and bulk transfer has been configured, records
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will accumulate in a bulk buffer. The bulk buffer will be sent
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to the client when the buffer is full or when the client's
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request has been satisfied; no particular type of record will
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cause the buffer to be sent.
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</p>
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<p>
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The size of the bulk buffer itself is internally determined
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and cannot be configured. However, the overall size of a
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transfer may be limited using the <a href="../api_reference/C/repset_limit.html" class="olink">DB_ENV->rep_set_limit()</a> method.
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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="rep_init.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_trans.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">Initializing a new site </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"> Transactional guarantees</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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