mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
75 lines
4.5 KiB
HTML
75 lines
4.5 KiB
HTML
<?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>DB_ENV->set_flags</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_3_2_toc.html" title="Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2" />
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<link rel="prev" href="upgrade_3_2_toc.html" title="Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2" />
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<link rel="next" href="upgrade_3_2_callback.html" title="DB callback functions, app_private field" />
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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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<p>Library Version 18.1.40</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">DB_ENV->set_flags</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_3_2_toc.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_2_callback.html">Next</a></td>
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</tr>
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</table>
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<hr />
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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_3_2_set_flags"></a>DB_ENV->set_flags</h2>
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</div>
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</div>
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</div>
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<p>A new method has been added to the Berkeley DB environment handle,
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<a href="../api_reference/C/envset_flags.html" class="olink">DB_ENV->set_flags()</a>. This method currently takes three flags:
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<a href="../api_reference/C/envset_flags.html#set_flags_DB_CDB_ALLDB" class="olink">DB_CDB_ALLDB</a>, <a href="../api_reference/C/dbopen.html#open_DB_NOMMAP" class="olink">DB_NOMMAP</a>, and <a href="../api_reference/C/envset_flags.html#envset_flags_DB_TXN_NOSYNC" class="olink">DB_TXN_NOSYNC</a>. The
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first of these flags, <a href="../api_reference/C/envset_flags.html#set_flags_DB_CDB_ALLDB" class="olink">DB_CDB_ALLDB</a>, provides new functionality,
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allowing Berkeley DB Concurrent Data Store applications to do locking across multiple databases.</p>
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<p>The other two flags, <a href="../api_reference/C/dbopen.html#open_DB_NOMMAP" class="olink">DB_NOMMAP</a> and <a href="../api_reference/C/envset_flags.html#envset_flags_DB_TXN_NOSYNC" class="olink">DB_TXN_NOSYNC</a>, were
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specified to the <a href="../api_reference/C/envopen.html" class="olink">DB_ENV->open()</a> method in previous releases. In
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the 3.2 release, they have been moved to the <a href="../api_reference/C/envset_flags.html" class="olink">DB_ENV->set_flags()</a> method
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because this allows the database environment's value to be toggled
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during the life of the application as well as because it is a more
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appropriate place for them. Applications specifying either the
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<a href="../api_reference/C/dbopen.html#open_DB_NOMMAP" class="olink">DB_NOMMAP</a> or <a href="../api_reference/C/envset_flags.html#envset_flags_DB_TXN_NOSYNC" class="olink">DB_TXN_NOSYNC</a> flags to the
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<a href="../api_reference/C/envopen.html" class="olink">DB_ENV->open()</a> method should replace those flags with calls to the
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<a href="../api_reference/C/envset_flags.html" class="olink">DB_ENV->set_flags()</a> method.</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_3_2_toc.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_3_2_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_2_callback.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">Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2 </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"> DB callback functions, app_private field</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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