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Replication Methods
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<div class="sect1" lang="en" xml:lang="en">
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<div>
<h2 class="title" style="clear: both"><a id="repnsites"></a>DbEnv::rep_set_nsites()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::rep_set_nsites(u_int32_t nsites); </pre>
<p>
The <code class="methodname">DbEnv::rep_set_nsites()</code> method specifies the total number of
sites in a replication group. This method should not be used by
Replication Manager applications; the number of sites in use by a
Replication Manager application is determined dynamically.
</p>
<p>
The <code class="methodname">DbEnv::rep_set_nsites()</code> method is typically called by
Base API applications. (However, see also the
<a class="xref" href="repelect.html" title="DbEnv::rep_elect()">DbEnv::rep_elect()</a> method
<span class="bold"><strong>nsites</strong></span>
parameter.)
</p>
<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
"rep_set_nsites", one or more whitespace characters, and the
number of sites specified. For example, "rep_set_nsites 5" sets
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
when the database environment is opened, it will silently overrule
configuration done before that time.
</p>
<p>
The <code class="methodname">DbEnv::rep_set_nsites()</code> method configures a database
environment, not only operations performed using the specified
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
</p>
<p>
If master leases are in use, the <code class="methodname">DbEnv::rep_set_nsites()</code> method
should not be called after the <a class="xref" href="repstart.html" title="DbEnv::rep_start()">DbEnv::rep_start()</a>
method is called as this could cause you to lose data previously
thought to be durable. If master leases are not in use, the
<code class="methodname">DbEnv::rep_set_nsites()</code> method may be
called at any time during the life of the application.
</p>
<p>
The <code class="methodname">DbEnv::rep_set_nsites()</code> <span>
<span>
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp9626936"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp9626032"></a>nsites</h4>
</div>
</div>
</div>
<p>
An integer specifying the total number of sites in the replication
group.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp9627792"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">DbEnv::rep_set_nsites()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp9636608"></a>EINVAL</h4>
</div>
</div>
</div>
<p>
If master leases are in use and replication has already been started; or if
an invalid flag value or parameter was specified.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp9635528"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp9625768"></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>
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