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Yasuhiro KIMURA
221 lines
8.7 KiB
HTML
221 lines
8.7 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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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DB_ENV->repmgr_set_incoming_queue_max()</title>
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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 C API Reference" />
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<link rel="up" href="rep.html" title="Chapter 10. Replication Methods" />
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<link rel="prev" href="repmgrset_ack_policy.html" title="DB_ENV->repmgr_set_ack_policy()" />
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<p>Library Version 18.1.40</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">
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<span xmlns="http://www.w3.org/1999/xhtml">DB_ENV->repmgr_set_incoming_queue_max()</span>
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="repmgrset_ack_policy.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 10.
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Replication Methods
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="repmgrset_socket.html">Next</a></td>
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</tr>
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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="repmgrset_incoming_queue_max"></a>
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<span>DB_ENV->repmgr_set_incoming_queue_max()</span>
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</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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DB_ENV->repmgr_set_incoming_queue_max(DB_ENV *env, u_int32_t gbytes,
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u_int32_t bytes); </pre>
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<p>
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The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> method sets
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a byte-count limit on the amount of dynamic memory used by the Replication Manager
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incoming queue. When the incoming queue reaches this limit, incoming messages are
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dropped until the Replication Manager processes some of the messages already in
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the queue. Any dropped messages are automatically rerequested at a later time.
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This limit is not a hard limit, and the message that exceeds this limit is the
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last one to be enqueued.
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</p>
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<p>
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The Replication Manager incoming queue has a default size limit of 100MB. We
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recommend a minimum size limit of 32MB.
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</p>
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<p>
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If the values passed to the <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code>
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method are both zero, then the incoming queue size limit is turned off.
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</p>
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<p>
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We recommend increasing the incoming queue size limit in the following cases:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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Master leases are enabled, particularly if there are many
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DB_REP_LEASE_EXPIRED errors.
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</p>
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</li>
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<li>
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<p>
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Clients are far behind the master.
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</p>
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</li>
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<li>
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<p>
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The master is using bulk transfer to send groups of records to the clients in a
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single network transfer.
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</p>
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</li>
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<li>
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<p>
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The master has blob databases and is performing many blob operations on them.
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</p>
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</li>
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<li>
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<p>
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The master is performing intensive write operations.
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</p>
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</li>
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</ul>
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</div>
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<p>
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The database environment's replication subsystem may also be
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configured using the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax
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of the entry in that file is a single line with the string
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"repmgr_set_incoming_queue_max", one or more whitespace characters,
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and the limit specified in two parts: the gigabytes and the bytes values.
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For example, "repmgr_set_incoming_queue_max 0 104857600" sets a 100 megabyte
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limit. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read when the database environment
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is opened, it will silently overrule configuration done before
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that time.
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</p>
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<p>
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The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> method
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configures a database environment, not only operations performed
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using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle.
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</p>
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<p>
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The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> method may be
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called at any time during the life of the application. If the limit is reduced,
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messages already in the queue are not removed, but further incoming messages are not
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added to the queue until its size drops below the new limit.
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</p>
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<p>
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The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> <span>
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<span>
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method returns a non-zero error value on failure and 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" 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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<h3 class="title"><a id="idm139753796880816"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="idm139753796864736"></a>gbytes</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>gbytes</strong></span> parameter specifies the number of
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gigabytes which, when added to the <span class="bold"><strong>bytes</strong></span>
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parameter, specifies the maximum size limit of the incoming queue.
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</p>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="idm139753796837024"></a>bytes</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>bytes</strong></span> parameter specifies the number of
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bytes which, when added to the <span class="bold"><strong>gbytes</strong></span>
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parameter, specifies the maximum size limit of the incoming queue.
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</p>
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</div>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="idm139753796843008"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
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</p>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="idm139753796833680"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a>
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</p>
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</div>
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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="repmgrset_ack_policy.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="repmgrset_socket.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">
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<span>DB_ENV->repmgr_set_ack_policy()</span>
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</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">
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<span>DB_ENV->repmgr_set_socket()</span>
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</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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