2011-09-13 17:44:24 +00:00
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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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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<html xmlns="http://www.w3.org/1999/xhtml">
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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>log_XXX</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_0_toc.html" title="Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0" />
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<link rel="prev" href="upgrade_4_0_lock.html" title="lock_XXX" />
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<link rel="next" href="upgrade_4_0_mp.html" title="memp_XXX" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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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">log_XXX</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_0_lock.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_4_0_mp.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_0_log"></a>log_XXX</h2>
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</div>
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</div>
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</div>
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<p>The C API for the Berkeley DB Logging subsystem was reworked in the 4.0
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release as follows:</p>
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<div class="informaltable">
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<table border="1" width="80%">
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<colgroup>
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<col />
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<col />
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</colgroup>
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<thead>
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<tr>
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<th>Historic functional interface</th>
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<th>Berkeley DB 4.X method</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>log_archive</td>
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<td>
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<a href="../api_reference/C/logarchive.html" class="olink">DB_ENV->log_archive()</a>
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</td>
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</tr>
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<tr>
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<td>log_file</td>
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<td>
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<a href="../api_reference/C/logfile.html" class="olink">DB_ENV->log_file()</a>
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</td>
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</tr>
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<tr>
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<td>log_flush</td>
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<td>
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<a href="../api_reference/C/logflush.html" class="olink">DB_ENV->log_flush()</a>
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</td>
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</tr>
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<tr>
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<td>log_get</td>
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<td>
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<a href="../api_reference/C/logcursor.html" class="olink">DB_ENV->log_cursor()</a>
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</td>
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</tr>
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<tr>
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<td>log_put</td>
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<td>
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<a href="../api_reference/C/logput.html" class="olink">DB_ENV->log_put()</a>
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</td>
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</tr>
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<tr>
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<td>log_register</td>
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<td>DB_ENV->log_register</td>
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</tr>
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<tr>
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<td>log_stat</td>
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<td>
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<a href="../api_reference/C/logstat.html" class="olink">DB_ENV->log_stat()</a>
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</td>
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</tr>
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<tr>
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<td>log_unregister</td>
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<td>DB_ENV->log_unregister</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>Applications calling any of these functions should update their calls
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to use the enclosing <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle's method (in all cases other
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than the log_get call, this is easily done as the first argument to the
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existing call is the correct handle to use).</p>
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<p>Application calls to the historic log_get function must be replaced
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with the creation of a log file cursor (a <a href="../api_reference/C/logc.html" class="olink">DB_LOGC class</a> object), using
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the <a href="../api_reference/C/logcursor.html" class="olink">DB_ENV->log_cursor()</a> method to retrieve log
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records and calls to the <a href="../api_reference/C/logcclose.html" class="olink">DB_LOGC->close()</a> method to destroy the cursor. It
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may also be possible to simplify some applications. In previous
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releases of Berkeley DB, the DB_CURRENT, DB_NEXT, and DB_PREV flags to the
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log_get function could not be used by a free-threaded <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a>
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handle. If their <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle was free-threaded, applications
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had to create an additional, unique environment handle by separately
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calling <a href="../api_reference/C/envopen.html" class="olink">DB_ENV->open()</a>. This
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is no longer an issue in the log cursor interface, and applications may
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be able to remove the now unnecessary creation of the additional
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<a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> object.</p>
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<p>Finally, the <a href="../api_reference/C/logstat.html" class="olink">DB_ENV->log_stat()</a> call has been changed in the 4.0 release
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to take a flags argument. To leave their historic behavior unchanged,
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applications should add a final argument of 0 to any calls made to
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<a href="../api_reference/C/logstat.html" class="olink">DB_ENV->log_stat()</a>.</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="upgrade_4_0_lock.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_4_0_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_4_0_mp.html">Next</a></td>
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</tr>
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<td width="40%" align="left" valign="top">lock_XXX </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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</table>
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</body>
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</html>
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