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HTML
191 lines
7.7 KiB
HTML
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<?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>DbEnv::rep_set_nsites()</title>
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<link rel="stylesheet" href="apiReference.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 C++ API Reference" />
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<link rel="up" href="rep.html" title="Chapter 11. Replication Methods" />
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<link rel="prev" href="repset_limit.html" title="DbEnv::rep_set_limit()" />
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<link rel="next" href="reppriority.html" title="DbEnv::rep_set_priority()" />
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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 11.2.5.2</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">DbEnv::rep_set_nsites()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="repset_limit.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 11.
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Replication Methods
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="reppriority.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="repnsites"></a>DbEnv::rep_set_nsites()</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_cxx.h>
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int
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DbEnv::rep_set_nsites(u_int32_t nsites); </pre>
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<p>
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The <code class="methodname">DbEnv::rep_set_nsites()</code> method specifies the total number of
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sites in a replication group. This method should not be used by
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Replication Manager applications; the number of sites in use by a
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Replication Manager application is determined dynamically.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_nsites()</code> method is typically called by
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Base API applications. (However, see also the
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<a class="xref" href="repelect.html" title="DbEnv::rep_elect()">DbEnv::rep_elect()</a> method
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<span class="bold"><strong>nsites</strong></span>
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parameter.)
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</p>
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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 of
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the entry in that file is a single line with the string
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"rep_set_nsites", one or more whitespace characters, and the
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number of sites specified. For example, "rep_set_nsites 5" sets
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the number of sites to 5. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read
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when the database environment is opened, it will silently overrule
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configuration done before that time.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_nsites()</code> method configures a database
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environment, not only operations performed using the specified
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
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</p>
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<p>
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If master leases are in use, the <code class="methodname">DbEnv::rep_set_nsites()</code> method
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should not be called after the <a class="xref" href="repstart.html" title="DbEnv::rep_start()">DbEnv::rep_start()</a>
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method is called as this could cause you to lose data previously
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thought to be durable. If master leases are not in use, the
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<code class="methodname">DbEnv::rep_set_nsites()</code> method may be
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called at any time during the life of the application.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_nsites()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 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="id3660170"></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="id3660163"></a>nsites</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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An integer specifying the total number of sites in the replication
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group.
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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="id3660185"></a>Errors</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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The <code class="methodname">DbEnv::rep_set_nsites()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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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="id3660338"></a>EINVAL</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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If master leases are in use and replication has already been started; or if
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an invalid flag value or parameter was specified.
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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="id3660320"></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 DbEnv Handle">DbEnv</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="id3659674"></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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|||
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<td width="40%" align="left"><a accesskey="p" href="repset_limit.html">Prev</a> </td>
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|||
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<td width="20%" align="center">
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|||
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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="reppriority.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">DbEnv::rep_set_limit() </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"> DbEnv::rep_set_priority()</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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