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<h2 class="title" style="clear: both"><a id="envset_tx_timestamp"></a>DB_ENV->set_tx_timestamp()</h2>
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<pre class="programlisting">#include <db.h>
int
DB_ENV->set_tx_timestamp(DB_ENV *dbenv, 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="../../programmer_reference/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">DB_ENV->set_tx_timestamp()</code> method configures operations performed
using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle, not all
operations performed on the underlying database environment.
</p>
<p>
The <code class="methodname">DB_ENV->set_tx_timestamp()</code> method may not be called after the
<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> method is
called.
</p>
<p>
The <code class="methodname">DB_ENV->set_tx_timestamp()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
</span>
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<h3 class="title"><a id="id1707980"></a>Parameters</h3>
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<div class="sect3" lang="en" xml:lang="en">
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<div>
<h4 class="title"><a id="id1707982"></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="id1708158"></a>Errors</h3>
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<p>
The <code class="methodname">DB_ENV->set_tx_timestamp()</code> <span>
<span>
method may fail and return one of the following non-zero errors:
</span>
</span>
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<h4 class="title"><a id="id1708167"></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="id1708168"></a>Class</h3>
</div>
</div>
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<p>
<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>,
<a class="link" href="txn.html" title="Chapter 12. The DB_TXN Handle">DB_TXN</a>
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<h3 class="title"><a id="id1708107"></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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