2011-09-13 17:44:24 +00:00
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<title>DB_TXN->set_commit_token()</title>
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<link rel="up" href="rep.html" title="Chapter 10. Replication Methods" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">DB_TXN->set_commit_token()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="envtxn_applied.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 10.
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Replication Methods
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="seq.html">Next</a></td>
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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="txnset_commit_token"></a>DB_TXN->set_commit_token()</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.h>
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int
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DB_TXN->set_commit_token(DB_TXN *txn, DB_TXN_TOKEN *buffer); </pre>
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<p>
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The <code class="methodname">DB_TXN->set_commit_token()</code> method
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configures the transaction for commit token generation, and accepts
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the address of an application-supplied buffer to receive the token.
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The actual generation of the token contents does not occur until
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commit time.
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</p>
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<p>
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Commit tokens are used to enable some consistency guarantees for
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replicated applications. Please see the
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<a href="../../programmer_reference/rep_ryw.html" class="olink">Read your writes consistency</a>
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section in the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>
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for more information.
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</p>
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<p>
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The <code class="methodname">DB_TXN->set_commit_token()</code> method may be
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called at any time after the
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<a class="xref" href="txnbegin.html" title="DB_ENV->txn_begin()">DB_ENV->txn_begin()</a>
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method has been called, and before
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<a class="xref" href="txncommit.html" title="DB_TXN->commit()">DB_TXN->commit()</a>
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has been called.
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</p>
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<p>
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The <code class="methodname">DB_TXN->set_commit_token()</code> <span>
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<span>
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method returns a non-zero error value on failure and 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="id3755500"></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="id3755611"></a>buffer</h4>
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2011-09-13 17:44:24 +00:00
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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 address of an application-supplied buffer.
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The buffer memory must remain available, and will
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be filled in later by Berkeley DB, at the time of
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the commit() call.
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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="id3755617"></a>Errors</h3>
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2011-09-13 17:44:24 +00:00
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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">DB_TXN->set_commit_token()</code> <span>
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<span>
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method may fail and return one 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="id3755079"></a>EINVAL</h4>
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2011-09-13 17:44:24 +00:00
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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 transaction is a nested transaction; if
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this method is called on a replication client;
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if the database environment is not configured
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for logging.
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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="id3755505"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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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="txn.html" title="Chapter 12. The DB_TXN Handle">DB_TXN</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="id3755684"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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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="txn.html#txnlist" title="Transaction Subsystem and Related Methods">Transaction Subsystem and Related Methods</a>,
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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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<td width="40%" align="left"><a accesskey="p" href="envtxn_applied.html">Prev</a> </td>
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<a accesskey="u" href="rep.html">Up</a>
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<td width="40%" align="right"> <a accesskey="n" href="seq.html">Next</a></td>
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<td width="40%" align="left" valign="top">DB_ENV->txn_applied() </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 width="40%" align="right" valign="top"> Chapter 11.
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The DB_SEQUENCE Handle
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</td>
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</tr>
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