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<!--$Id: txn_class.so,v 10.13 2000/12/04 18:05:39 bostic Exp $-->
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<title>Berkeley DB: DbTxn</title>
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<h1>DbTxn</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
class DbTxn { ... };
</pre></h3>
<h1>Description</h1>
<p>This manual page describes the specific details of the DbTxn class.
<p>The <a href="../api_cxx/dbenv_class.html">DbEnv</a> transaction methods and the DbTxn class provide
transaction semantics. Full transaction support is provided by a
collection of modules that provide interfaces to the services required
for transaction processing. These services are recovery, concurrency
control and the management of shared data.
<p>Transaction semantics can be applied to the access methods described in
Db through method call parameters.
<p>The model intended for transactional use (and the one that is used by
the access methods) is write-ahead logging to record both before- and
after-images. Locking follows a two-phase protocol, with all locks being
released at transaction commit.
<h3>Classes</h3>
<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
<h1>See Also</h1>
<a href="../api_cxx/env_set_tx_max.html">DbEnv::set_tx_max</a>,
<a href="../api_cxx/env_set_tx_recover.html">DbEnv::set_tx_recover</a>,
<a href="../api_cxx/env_set_tx_timestamp.html">DbEnv::set_tx_timestamp</a>,
<a href="../api_cxx/txn_abort.html">DbTxn::abort</a>,
<a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a>,
<a href="../api_cxx/txn_checkpoint.html">DbEnv::txn_checkpoint</a>,
<a href="../api_cxx/txn_commit.html">DbTxn::commit</a>,
<a href="../api_cxx/txn_id.html">DbTxn::id</a>,
<a href="../api_cxx/txn_prepare.html">DbTxn::prepare</a>
and
<a href="../api_cxx/txn_stat.html">DbEnv::txn_stat</a>.
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