<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>log_XXX</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" /> <link rel="up" href="upgrade_4_0_toc.html" title="Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0" /> <link rel="prev" href="upgrade_4_0_lock.html" title="lock_XXX" /> <link rel="next" href="upgrade_4_0_mp.html" title="memp_XXX" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">log_XXX</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="upgrade_4_0_lock.html">Prev</a> </td> <th width="60%" align="center">Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0</th> <td width="20%" align="right"> <a accesskey="n" href="upgrade_4_0_mp.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="upgrade_4_0_log"></a>log_XXX</h2> </div> </div> </div> <p>The C API for the Berkeley DB Logging subsystem was reworked in the 4.0 release as follows:</p> <div class="informaltable"> <table border="1" width="80%"> <colgroup> <col /> <col /> </colgroup> <thead> <tr> <th>Historic functional interface</th> <th>Berkeley DB 4.X method</th> </tr> </thead> <tbody> <tr> <td>log_archive</td> <td> <a href="../api_reference/C/logarchive.html" class="olink">DB_ENV->log_archive()</a> </td> </tr> <tr> <td>log_file</td> <td> <a href="../api_reference/C/logfile.html" class="olink">DB_ENV->log_file()</a> </td> </tr> <tr> <td>log_flush</td> <td> <a href="../api_reference/C/logflush.html" class="olink">DB_ENV->log_flush()</a> </td> </tr> <tr> <td>log_get</td> <td> <a href="../api_reference/C/logcursor.html" class="olink">DB_ENV->log_cursor()</a> </td> </tr> <tr> <td>log_put</td> <td> <a href="../api_reference/C/logput.html" class="olink">DB_ENV->log_put()</a> </td> </tr> <tr> <td>log_register</td> <td>DB_ENV->log_register</td> </tr> <tr> <td>log_stat</td> <td> <a href="../api_reference/C/logstat.html" class="olink">DB_ENV->log_stat()</a> </td> </tr> <tr> <td>log_unregister</td> <td>DB_ENV->log_unregister</td> </tr> </tbody> </table> </div> <p>Applications calling any of these functions should update their calls to use the enclosing <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle's method (in all cases other than the log_get call, this is easily done as the first argument to the existing call is the correct handle to use).</p> <p>Application calls to the historic log_get function must be replaced with the creation of a log file cursor (a <a href="../api_reference/C/logc.html" class="olink">DB_LOGC class</a> object), using the <a href="../api_reference/C/logcursor.html" class="olink">DB_ENV->log_cursor()</a> method to retrieve log records and calls to the <a href="../api_reference/C/logcclose.html" class="olink">DB_LOGC->close()</a> method to destroy the cursor. It may also be possible to simplify some applications. In previous releases of Berkeley DB, the DB_CURRENT, DB_NEXT, and DB_PREV flags to the log_get function could not be used by a free-threaded <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle. If their <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle was free-threaded, applications had to create an additional, unique environment handle by separately calling <a href="../api_reference/C/envopen.html" class="olink">DB_ENV->open()</a>. This is no longer an issue in the log cursor interface, and applications may be able to remove the now unnecessary creation of the additional <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> object.</p> <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 to take a flags argument. To leave their historic behavior unchanged, applications should add a final argument of 0 to any calls made to <a href="../api_reference/C/logstat.html" class="olink">DB_ENV->log_stat()</a>.</p> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="upgrade_4_0_lock.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="upgrade_4_0_toc.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="upgrade_4_0_mp.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">lock_XXX </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> memp_XXX</td> </tr> </table> </div> </body> </html>