<!--$Id: txn_class.so,v 10.15 2001/04/18 13:44:48 bostic Exp $--> <!--Copyright 1997-2001 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <html> <head> <title>Berkeley DB: DbTxn</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h1>DbTxn</h1> </td> <td align=right> <a href="../../db4-devel-4.0.14/api_java/c_index.html"><img src="../../db4-4.0.14/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.0.14/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> import com.sleepycat.db.*; <p> public class DbTxn extends Object { ... } </pre></h3> <h1>Description</h1> <p>This manual page describes the specific details of the DbTxn class. <p>The <a href="../../db4-devel-4.0.14/api_java/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. <h1>Class</h1> <a href="../../db4-devel-4.0.14/api_java/dbenv_class.html">DbEnv</a>, <a href="../../db4-devel-4.0.14/api_java/txn_class.html">DbTxn</a> <h1>See Also</h1> <a href="../../db4-devel-4.0.14/api_java/env_set_tx_max.html">DbEnv.set_tx_max</a>, <a href="../../db4-devel-4.0.14/api_java/env_set_tx_timestamp.html">DbEnv.set_tx_timestamp</a>, <a href="../../db4-devel-4.0.14/api_java/txn_abort.html">DbTxn.abort</a>, <a href="../../db4-devel-4.0.14/api_java/txn_begin.html">DbEnv.txn_begin</a>, <a href="../../db4-devel-4.0.14/api_java/txn_checkpoint.html">DbEnv.txn_checkpoint</a>, <a href="../../db4-devel-4.0.14/api_java/txn_commit.html">DbTxn.commit</a>, <a href="../../db4-devel-4.0.14/api_java/txn_discard.html">DbTxn.discard</a>, <a href="../../db4-devel-4.0.14/api_java/txn_id.html">DbTxn.id</a>, <a href="../../db4-devel-4.0.14/api_java/txn_prepare.html">DbTxn.prepare</a>, <a href="../../db4-devel-4.0.14/api_java/txn_recover.html">DbEnv.txn_recover</a>, <a href="../../db4-devel-4.0.14/api_java/txn_set_timeout.html">DbTxn.set_timeout</a> and <a href="../../db4-devel-4.0.14/api_java/txn_stat.html">DbEnv.txn_stat</a>. </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.0.14/api_java/c_index.html"><img src="../../db4-4.0.14/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.0.14/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>