2011-09-13 17:44:24 +00:00
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<title>DbEnv::repmgr_start()</title>
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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="repmgrsite_list.html" title="DbEnv::repmgr_site_list()" />
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<link rel="next" href="repmgrstat.html" title="DbEnv::repmgr_stat()" />
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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::repmgr_start()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="repmgrsite_list.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="repmgrstat.html">Next</a></td>
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</tr>
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</table>
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<hr />
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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="repmgrstart"></a>DbEnv::repmgr_start()</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::repmgr_start(int nthreads, u_int32_t flags);</pre>
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<p>
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The <code class="methodname">DbEnv::repmgr_start()</code> method starts the Replication Manager.
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</p>
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<p>
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There are two ways to build Berkeley DB replication applications: the
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most common approach is to use the Berkeley DB library Replication
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Manager, where the Berkeley DB library manages the
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replication group, including network transport, all replication
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message processing and acknowledgment, and group elections.
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Applications using the Replication Manager generally make the
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following calls:
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</p>
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<div class="orderedlist">
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<ol type="1">
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<li>
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<p>
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Use <a class="xref" href="repmgr_site.html" title="DbEnv::repmgr_site()">DbEnv::repmgr_site()</a>
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to obtain a DbSite handle, then use that handle to
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configure the sites in your replication group.
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</p>
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<div class="orderedlist">
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<ol type="a">
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<li>
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<p>
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Use <a class="xref" href="dbsite_set_config.html" title="DbSite::set_config()">DbSite::set_config()</a>
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to configure sites in your replication group.
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</p>
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</li>
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<li>
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<p>
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Use <a class="xref" href="dbsite_remove.html" title="DbSite::remove()">DbSite::remove()</a>
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to remove a site from the replication group.
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</p>
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</li>
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</ol>
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</div>
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</li>
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<li>
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<p>
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Call
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<a class="xref" href="repmgrset_ack_policy.html" title="DbEnv::repmgr_set_ack_policy()">DbEnv::repmgr_set_ack_policy()</a>
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to configure the message acknowledgment policy which best supports the
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replication group's transactional needs.
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</p>
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</li>
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<li>
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<p>
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Call
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<a class="xref" href="reppriority.html" title="DbEnv::rep_set_priority()">DbEnv::rep_set_priority()</a>
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to configure the local site's election priority.
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</p>
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</li>
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<li>
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<p>
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Call <code class="methodname">DbEnv::repmgr_start()</code> to start the replication application.
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</p>
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</li>
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</ol>
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</div>
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<p>
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For more information on building Replication Manager applications,
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please see the <em class="citetitle">Replication Getting Started Guide</em>
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included in the Berkeley DB documentation.
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</p>
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<p>
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Applications with special needs (for example, applications using
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network protocols not supported by the Berkeley DB Replication
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Manager), must perform additional configuration and call other
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Berkeley DB replication Base API methods. For more information on building
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Base API applications, please see the
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<a href="../../programmer_reference/rep_base_meth.html" class="olink">Base API Methods</a> section in the
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<em class="citetitle">Berkeley DB Programmer's Reference Guide</em>.
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</p>
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<p>
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Starting the Replication Manager consists of opening the TCP/IP listening socket to accept
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incoming connections, and starting all necessary background threads. When multiple processes
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share a database environment, only one process can open the listening socket; the
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<code class="methodname">DbEnv::repmgr_start()</code> method automatically opens the socket in the
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first process to call it, and skips this step in the later calls from other processes.
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</p>
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<p>
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The <code class="methodname">DbEnv::repmgr_start()</code> method
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may not be called before the <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is
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called to open. In addition, this method may not be called before
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your replication sites have been configured using the
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<a class="link" href="db_site.html" title="The DbSite Handle">DbSite</a> class.
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In addition, the local environment must be opened with the
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<a class="link" href="envopen.html#envopen_DB_THREAD">DB_THREAD</a>
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flag set.
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</p>
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<p>
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The <code class="methodname">DbEnv::repmgr_start()</code> method will return
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<code class="literal">DB_REP_IGNORE</code>
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as an informational, non-error return code, if another process has previously become the
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TCP/IP listener (though the current call has nevertheless successfully started Replication
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Manager's background threads). Unless otherwise specified, the
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<code class="methodname">DbEnv::repmgr_start()</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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3646250"></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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3646378"></a>nthreads</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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Specify the number of threads of control created and dedicated to
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processing replication messages. In addition to these message
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processing threads, the Replication Manager creates and manages a few
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of its own threads of control.
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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="id3645922"></a>flags</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>flags</strong></span> parameter must be set to
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one of the following values:
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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><a id="repmgrstart_DB_REP_MASTER"></a>
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<code class="literal">DB_REP_MASTER</code>
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</p>
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<p>
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Start as a master site, and do not call for an election. Note there
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must never be more than a single master in any replication group, and
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only one site at a time should ever be started with the DB_REP_MASTER
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flag specified.
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</p>
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</li>
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<li>
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<p><a id="repmgrstart_DB_REP_CLIENT"></a>
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<code class="literal">DB_REP_CLIENT</code>
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</p>
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<p>
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Start as a client site, and do not call for an election.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_REP_ELECTION</code>
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</p>
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<p>
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Start as a client, and call for an election if no master is found.
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</p>
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</li>
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</ul>
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</div>
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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="id3646368"></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::repmgr_start()</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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3646286"></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 the database environment was not already opened or was
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opened without the <code class="literal">DB_THREAD</code> flag set; a local
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site has not already been configured, this method is called
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from a Base API application; or if an invalid
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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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3646639"></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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3646537"></a>See Also</h3>
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</div>
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</div>
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