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  • Committer: Bazaar Package Importer
  • Author(s): Joey Hess
  • Date: 2002-01-22 20:56:57 UTC
  • Revision ID: james.westby@ubuntu.com-20020122205657-l74j50mr9z8ofcl5
Tags: upstream-4.0.3
Import upstream version 4.0.3

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db/docs/ref/txn/config.html
 
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<!--$Id: config.so,v 10.17 2001/05/22 01:44:41 bostic Exp $-->
 
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<!--Copyright 1997-2001 by Sleepycat Software, Inc.-->
 
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<!--All rights reserved.-->
 
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<html>
 
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<head>
 
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<title>Berkeley DB Reference Guide: Configuring transactions</title>
 
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
 
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
 
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</head>
 
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<body bgcolor=white>
 
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<a name="2"><!--meow--></a>
 
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<table width="100%"><tr valign=top>
 
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Transaction Subsystem</dl></h3></td>
 
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<td align=right><a href="../../ref/txn/intro.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/txn/limits.html"><img src="../../images/next.gif" alt="Next"></a>
 
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</td></tr></table>
 
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<p>
 
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<h1 align=center>Configuring transactions</h1>
 
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<p>There is only a single parameter used in configuring transactions; the
 
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<a href="../../api_c/env_open.html#DB_TXN_NOSYNC">DB_TXN_NOSYNC</a> flag.  Setting the <a href="../../api_c/env_open.html#DB_TXN_NOSYNC">DB_TXN_NOSYNC</a> flag to
 
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<a href="../../api_c/env_set_flags.html">DB_ENV-&gt;set_flags</a> when opening a transaction region changes the
 
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behavior of transactions to not synchronously flush the log during
 
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transaction commit.
 
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<p>This change will significantly increase application transactional
 
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throughput.  However, it means that although transactions will continue
 
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to exhibit the ACI (atomicity, consistency, and isolation) properties,
 
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they will not have D (durability).  Database integrity will be
 
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maintained, but it is possible that some number of the most recently
 
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committed transactions may be undone during recovery instead of being
 
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redone.
 
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<p>The application may also change the number of simultaneous outstanding
 
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transactions supported by the Berkeley DB environment by calling the
 
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<a href="../../api_c/env_set_tx_max.html">DB_ENV-&gt;set_tx_max</a> function.  When this number is reached, additional
 
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calls to <a href="../../api_c/txn_begin.html">txn_begin</a> will fail until some active transactions
 
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complete.
 
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<table width="100%"><tr><td><br></td><td align=right><a href="../../ref/txn/intro.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/txn/limits.html"><img src="../../images/next.gif" alt="Next"></a>
 
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</td></tr></table>
 
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
 
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</body>
 
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</html>