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The DB_TXN Handle
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<h2 class="title"><a id="txn"></a>Chapter 12.
The DB_TXN Handle
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<pre class="programlisting">#include <db.h>
typedef struct __db_txn DB_TXN; </pre>
<p>
The <code class="classname">DB_TXN</code> object is the handle for a transaction. Methods of
the <code class="classname">DB_TXN</code> handle are used to configure, abort and commit the
transaction. <code class="classname">DB_TXN</code> handles are provided to
<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> methods in order
to transactionally protect those database operations.
</p>
<p>
<code class="classname">DB_TXN</code> handles are not free-threaded; transactions handles
may be used by multiple threads, but only serially, that is, the application must
serialize access to the <code class="classname">DB_TXN</code> handle. Once the
<a class="xref" href="txnabort.html" title="DB_TXN->abort()">DB_TXN->abort()</a> or
<a class="xref" href="txncommit.html" title="DB_TXN->commit()">DB_TXN->commit()</a> methods are called, the handle
may not be accessed again, regardless of the method's return. In addition, parent
transactions may not issue any Berkeley DB operations while they have active child
transactions (child transactions that have not yet been committed or aborted) except for
<a class="xref" href="txnbegin.html" title="DB_ENV->txn_begin()">DB_ENV->txn_begin()</a>,
<a class="xref" href="txnabort.html" title="DB_TXN->abort()">DB_TXN->abort()</a> and
<a class="xref" href="txncommit.html" title="DB_TXN->commit()">DB_TXN->commit()</a>.
</p>
<div class="sect1" lang="en" xml:lang="en">
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<h2 class="title" style="clear: both"><a id="txnlist"></a>Transaction Subsystem and Related Methods</h2>
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<th>Transaction Subsystem and Related Methods</th>
<th>Description</th>
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<td>
<a class="xref" href="txncheckpoint.html" title="DB_ENV->txn_checkpoint()">DB_ENV->txn_checkpoint()</a>
</td>
<td>Checkpoint the transaction subsystem</td>
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<td>
<a class="xref" href="txnrecover.html" title="DB_ENV->txn_recover()">DB_ENV->txn_recover()</a>
</td>
<td>Distributed transaction recovery</td>
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<tr>
<td>
<a class="xref" href="txnset_timeout.html" title="DB_TXN->set_timeout()">DB_TXN->set_timeout()</a>
</td>
<td>Set transaction timeout</td>
</tr>
<tr>
<td>
<a class="xref" href="txnstat.html" title="DB_ENV->txn_stat()">DB_ENV->txn_stat()</a>
</td>
<td>Return transaction subsystem statistics</td>
</tr>
<tr>
<td>
<a class="xref" href="txnstat_print.html" title="DB_ENV->txn_stat_print()">DB_ENV->txn_stat_print()</a>
</td>
<td>Print transaction subsystem statistics</td>
</tr>
<tr>
<td colspan="2">
<span class="bold">
<strong>Transaction Subsystem Configuration</strong>
</span>
</td>
</tr>
<tr>
<td><a class="xref" href="envset_timeout.html" title="DB_ENV->set_timeout()">DB_ENV->set_timeout()</a>, <a class="xref" href="envget_timeout.html" title="DB_ENV->get_timeout()">DB_ENV->get_timeout()</a></td>
<td>Set/get lock and transaction timeout</td>
</tr>
<tr>
<td>
<a class="xref" href="dbget_transactional.html" title="DB->get_transactional()">DB->get_transactional()</a>
</td>
<td>Does the DB have transaction support</td>
</tr>
<tr>
<td>
<a class="xref" href="envcdsgroup_begin.html" title="DB_ENV->cdsgroup_begin()">DB_ENV->cdsgroup_begin()</a>
</td>
<td>Get a locker ID in Berkeley DB Concurrent Data Store</td>
</tr>
<tr>
<td><a class="xref" href="envset_tx_max.html" title="DB_ENV->set_tx_max()">DB_ENV->set_tx_max()</a>, <a class="xref" href="envget_tx_max.html" title="DB_ENV->get_tx_max()">DB_ENV->get_tx_max()</a></td>
<td>Set/get maximum number of transactions</td>
</tr>
<tr>
<td><a class="xref" href="envset_tx_timestamp.html" title="DB_ENV->set_tx_timestamp()">DB_ENV->set_tx_timestamp()</a>, <a class="xref" href="envget_tx_timestamp.html" title="DB_ENV->get_tx_timestamp()">DB_ENV->get_tx_timestamp()</a></td>
<td>Set/get recovery timestamp</td>
</tr>
<tr>
<td colspan="2">
<span class="bold">
<strong>Transaction Operations</strong>
</span>
</td>
</tr>
<tr>
<td>
<a class="xref" href="txnabort.html" title="DB_TXN->abort()">DB_TXN->abort()</a>
</td>
<td>Abort a transaction</td>
</tr>
<tr>
<td>
<a class="xref" href="txnbegin.html" title="DB_ENV->txn_begin()">DB_ENV->txn_begin()</a>
</td>
<td>Begin a transaction</td>
</tr>
<tr>
<td>
<a class="xref" href="txncommit.html" title="DB_TXN->commit()">DB_TXN->commit()</a>
</td>
<td>Commit a transaction</td>
</tr>
<tr>
<td>
<a class="xref" href="txndiscard.html" title="DB_TXN->discard()">DB_TXN->discard()</a>
</td>
<td>Discard a prepared but not resolved transaction handle</td>
</tr>
<tr>
<td>
<a class="xref" href="txnid.html" title="DB_TXN->id()">DB_TXN->id()</a>
</td>
<td>Return a transaction's ID</td>
</tr>
<tr>
<td>
<a class="xref" href="txnprepare.html" title="DB_TXN->prepare()">DB_TXN->prepare()</a>
</td>
<td>Prepare a transaction for commit</td>
</tr>
<tr>
<td><a class="xref" href="txnset_name.html" title="DB_TXN->set_name()">DB_TXN->set_name()</a>, <a class="xref" href="txnget_name.html" title="DB_TXN->get_name()">DB_TXN->get_name()</a></td>
<td>Associate a string with a transaction</td>
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