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<h2 class="title" style="clear: both"><a id="envset_tx_timestamp"></a>DbEnv::set_tx_timestamp()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::set_tx_timestamp(time_t *timestamp); </pre>
<p>
Recover to the time specified by <span class="bold"><strong>timestamp</strong></span> rather than to the most current
possible date.
</p>
<p>
Once a database environment has been upgraded to a new version of
Berkeley DB involving a log format change
(see <a href="../../upgrading/upgrade_process.html" class="olink">Upgrading Berkeley DB installations</a>),
it is no longer possible to recover to a
specific time before that upgrade.
</p>
<p>
The <code class="methodname">DbEnv::set_tx_timestamp()</code> method configures operations performed
using the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle, not all
operations performed on the underlying database environment.
</p>
<p>
The <code class="methodname">DbEnv::set_tx_timestamp()</code> method may not be called after the
<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is
called.
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<p>
The <code class="methodname">DbEnv::set_tx_timestamp()</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.
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<h3 class="title"><a id="idp10286144"></a>Parameters</h3>
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<div class="titlepage">
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<h4 class="title"><a id="idp10286808"></a>timestamp</h4>
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<p>
The <span class="bold"><strong>timestamp</strong></span> parameter references
the memory location where the recovery timestamp is located.
</p>
<p>
The <span class="bold"><strong>timestamp</strong></span> parameter should be the
number of seconds since 0 hours, 0 minutes, 0 seconds, January 1,
1970, Coordinated Universal Time; that is, the Epoch.
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<h3 class="title"><a id="idp10275376"></a>Errors</h3>
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<p>
The <code class="methodname">DbEnv::set_tx_timestamp()</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>
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<h4 class="title"><a id="idp10294384"></a>EINVAL</h4>
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<p>
If it is not possible to recover to the specified time using the log
files currently present in the environment; or if an invalid flag
value or parameter was specified.
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<h3 class="title"><a id="idp10293304"></a>Class</h3>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
<a class="link" href="txn.html" title="Chapter 13. The DbTxn Handle">DbTxn</a>
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<h3 class="title"><a id="idp10295712"></a>See Also</h3>
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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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