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<h2 class="title" style="clear: both"><a id="envcdsgroup_begin"></a>
<span>DbEnv::cdsgroup_begin()</span>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::cdsgroup_begin(DbTxn **tid);</pre>
<p>
The <code class="methodname">DbEnv::cdsgroup_begin()</code> method allocates a locker ID in an
environment configured for Berkeley DB Concurrent Data Store
applications. It copies a pointer to a
<a class="link" href="txn.html" title="Chapter 13. The DbTxn Handle">DbTxn</a> that uniquely identifies
the locker ID into the memory to which <span class="bold"><strong>tid</strong></span> refers.
Calling the
<a class="xref" href="txncommit.html" title="DbTxn::commit()">
<span>DbTxn::commit()</span>
</a> method will
discard the allocated locker ID.
</p>
<p>
See <a href="../../programmer_reference/cam.html#cam_intro" class="olink">Berkeley DB Concurrent Data Store applications</a>
for more information about when this is required.
</p>
<p>
This method may not be called on a sliced database.
</p>
<p>
The <code class="methodname">DbEnv::cdsgroup_begin()</code> method may be called at any time during
the life of the application.
</p>
<p>
The <code class="methodname">DbEnv::cdsgroup_begin()</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.
</span>
</span>
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<h3 class="title"><a id="idm139755609394432"></a>Errors</h3>
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<p>
The <code class="methodname">DbEnv::cdsgroup_begin()</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>
</span>
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<h4 class="title"><a id="idm139755609374400"></a>EINVAL</h4>
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<p>
If this method is called on a sliced database;
or if an invalid flag value or parameter was specified.
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<h4 class="title"><a id="idm139755609377792"></a>ENOMEM</h4>
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<p>
The maximum number of lockers has been reached.
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<h3 class="title"><a id="idm139755609740592"></a>Class</h3>
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<p>
<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="idm139755609386016"></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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