1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
<?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>DB_ENV->repmgr_set_incoming_queue_max()</title>
<link rel="stylesheet" href="apiReference.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
<link rel="up" href="rep.html" title="Chapter 10. Replication Methods" />
<link rel="prev" href="repmgrset_ack_policy.html" title="DB_ENV->repmgr_set_ack_policy()" />
<link rel="next" href="repmgr_site.html" title="DB_ENV->repmgr_site()" />
</head>
<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 12.1.6.1</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">
DB_ENV->repmgr_set_incoming_queue_max()
</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="repmgrset_ack_policy.html">Prev</a> </td>
<th width="60%" align="center">Chapter 10.
Replication Methods
</th>
<td width="20%" align="right"> <a accesskey="n" href="repmgr_site.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="repmgrset_incoming_queue_max"></a>
DB_ENV->repmgr_set_incoming_queue_max()
</h2>
</div>
</div>
</div>
<pre class="programlisting">#include <db.h>
int
DB_ENV->repmgr_set_incoming_queue_max(DB_ENV *env, u_int32_t gbytes,
u_int32_t bytes); </pre>
<p>
The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> method sets
a byte-count limit on the amount of dynamic memory used by the Replication Manager
incoming queue. When the incoming queue reaches this limit, incoming messages are
dropped until the Replication Manager processes some of the messages already in
the queue. Any dropped messages are automatically rerequested at a later time.
This limit is not a hard limit, and the message that exceeds this limit is the
last one to be enqueued.
</p>
<p>
The Replication Manager incoming queue has a default size limit of 100MB. We
recommend a minimum size limit of 32MB.
</p>
<p>
If the values passed to the <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code>
method are both zero, then the incoming queue size limit is turned off.
</p>
<p>
We recommend increasing the incoming queue size limit in the following cases:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
Master leases are enabled, particularly if there are many
DB_REP_LEASE_EXPIRED errors.
</p>
</li>
<li>
<p>
Clients are far behind the master.
</p>
</li>
<li>
<p>
The master is using bulk transfer to send groups of records to the clients in a
single network transfer.
</p>
</li>
<li>
<p>
The master has blob databases and is performing many blob operations on them.
</p>
</li>
<li>
<p>
The master is performing intensive write operations.
</p>
</li>
</ul>
</div>
<p>
The database environment's replication subsystem may also be
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
of the entry in that file is a single line with the string
"repmgr_set_incoming_queue_max", one or more whitespace characters,
and the limit specified in two parts: the gigabytes and the bytes values.
For example, "repmgr_set_incoming_queue_max 0 104857600" sets a 100 megabyte
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
is opened, it will silently overrule configuration done before
that time.
</p>
<p>
The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> method
configures a database environment, not only operations performed
using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle.
</p>
<p>
The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> method may be
called at any time during the life of the application. If the limit is reduced,
messages already in the queue are not removed, but further incoming messages are not
added to the queue until its size drops below the new limit.
</p>
<p>
The <code class="methodname">DB_ENV->repmgr_set_incoming_queue_max()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp4101520"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp4095376"></a>gbytes</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>gbytes</strong></span> parameter specifies the number of
gigabytes which, when added to the <span class="bold"><strong>bytes</strong></span>
parameter, specifies the maximum size limit of the incoming queue.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp4127840"></a>bytes</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>bytes</strong></span> parameter specifies the number of
bytes which, when added to the <span class="bold"><strong>gbytes</strong></span>
parameter, specifies the maximum size limit of the incoming queue.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp4130856"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp4094416"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a>
</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="repmgrset_ack_policy.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="rep.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="repmgr_site.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">DB_ENV->repmgr_set_ack_policy() </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> DB_ENV->repmgr_site()</td>
</tr>
</table>
</div>
</body>
</html>
|
