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238 lines
9.6 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>DbEnv::rep_start()</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 11. Replication Methods" />
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<link rel="prev" href="reptransport.html" title="DbEnv::rep_set_transport()" />
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<link rel="next" href="repstat.html" title="DbEnv::rep_stat()" />
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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_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="reptransport.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="repstat.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="repstart"></a>DbEnv::rep_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::rep_start(Dbt *cdata, u_int32_t flags);</pre>
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<p>
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The <code class="methodname">DbEnv::rep_start()</code> method configures the database environment as
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a client or master in a group of replicated database environments.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_start()</code> method is not called by most replication
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applications. It should only be called by Base API applications implementing
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their own network transport layer, explicitly holding replication
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group elections and handling replication messages outside of the
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Replication Manager framework.
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</p>
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<p>
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Replication master environments are the only database environments
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where replicated databases may be modified. Replication client
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environments are read-only as long as they are clients. Replication
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client environments may be upgraded to be replication master
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environments in the case that the current master fails or there is no
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master present. If master leases are in use, this method cannot be
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used to appoint a master, and should only be used to configure a database
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environment as a master as the result of an election.
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</p>
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<p>
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The enclosing database environment must already have been opened by
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calling the <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method and must
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already have been configured to send replication messages by calling
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the <a class="xref" href="reptransport.html" title="DbEnv::rep_set_transport()">DbEnv::rep_set_transport()</a>
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method.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_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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<h3 class="title"><a id="id3661433"></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="id3661980"></a>cdata</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>cdata</strong></span> parameter is an opaque data
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item that is sent over the communication infrastructure when the client
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comes online (see <a href="../../programmer_reference/rep_newsite.html" class="olink">Connecting to a new site</a> for more information). If no such information is useful,
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<span class="bold"><strong>cdata</strong></span> should be NULL.
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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="id3661069"></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>
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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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Configure the environment as a replication client.
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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_MASTER</code>
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</p>
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<p>
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Configure the environment as a replication master.
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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="id3662000"></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_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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<h4 class="title"><a id="id3662142"></a>DB_REP_UNAVAIL</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 flags parameter was passed as
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DB_REP_MASTER but the database environment
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cannot currently become the replication master
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because it is temporarily initializing and is
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incomplete.
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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="id3662124"></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 configured to communicate
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with a replication group by a call to
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<a class="xref" href="reptransport.html" title="DbEnv::rep_set_transport()">DbEnv::rep_set_transport()</a>;
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the database environment was not already opened;
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this method is called from a Replication Manager application; outstanding
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master leases are granted; this method is used to appoint a new master when
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master leases are in use; or if 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="id3661909"></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="id3661934"></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="reptransport.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="repstat.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_transport() </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_stat()</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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