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HTML
74 lines
3.7 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Client replication environments</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" />
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<link rel="up" href="upgrade_4_2_toc.html" title="Chapter 8. Upgrading Berkeley DB 4.1 applications to Berkeley DB 4.2" />
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<link rel="prev" href="upgrade_4_2_repinit.html" title="Replication" />
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<link rel="next" href="upgrade_4_2_tcl.html" title="Tcl API" />
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Client replication environments</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="upgrade_4_2_repinit.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 8. Upgrading Berkeley DB 4.1 applications to Berkeley DB 4.2</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_4_2_tcl.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="upgrade_4_2_nosync"></a>Client replication environments</h2>
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</div>
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</div>
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</div>
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<p>In previous Berkeley DB releases, replication clients always behaved as if
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<a href="../api_reference/C/envset_flags.html#envset_flags_DB_TXN_NOSYNC" class="olink">DB_TXN_NOSYNC</a> behavior was configured, that is, clients would
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not write or synchronously flush their log when receiving a transaction
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commit or prepare message. However, applications needing a high level
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of transactional guarantee may need a write and synchronous flush on
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the client. By default in the Berkeley DB 4.2 release, client database
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environments write and synchronously flush their logs when receiving a
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transaction commit or prepare message. Applications not needing such
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a high level of transactional guarantee should use the environment's
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<a href="../api_reference/C/envset_flags.html#envset_flags_DB_TXN_NOSYNC" class="olink">DB_TXN_NOSYNC</a> flag to configure their client database
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environments to not do the write or flush on transaction commit, as this
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will increase their performance. Regardless of the setting of the
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<a href="../api_reference/C/envset_flags.html#envset_flags_DB_TXN_NOSYNC" class="olink">DB_TXN_NOSYNC</a> flag, clients will always write and flush on
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transaction prepare.</p>
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</div>
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<hr />
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<table width="100%" summary="Navigation footer">
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<td width="40%" align="left"><a accesskey="p" href="upgrade_4_2_repinit.html">Prev</a> </td>
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<a accesskey="u" href="upgrade_4_2_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_4_2_tcl.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Replication </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Tcl API</td>
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</body>
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