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HTML
199 lines
8.1 KiB
HTML
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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>DBINFO structure</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_0_toc.html" title="Chapter 14. Upgrading Berkeley DB 2.X applications to Berkeley DB 3.0" />
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<link rel="prev" href="upgrade_3_0_db.html" title="DB structure" />
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<link rel="next" href="upgrade_3_0_join.html" title="DB->join" />
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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 11.2.5.2</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">DBINFO structure</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_0_db.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 14. Upgrading Berkeley DB 2.X applications to Berkeley DB 3.0</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_0_join.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_3_0_dbinfo"></a>DBINFO structure</h2>
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</div>
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</div>
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</div>
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<p>The DB_INFO structure has been removed from the Berkeley DB 3.0 release.
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Accesses to any fields within that structure by the application should be
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replaced with method calls on the <a href="../api_reference/C/db.html" class="olink">DB</a> handle. The following
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example illustrates this using the historic db_cachesize structure field.
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In the Berkeley DB 2.X releases, applications could set the size of an
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underlying database cache using code similar to the following:</p>
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<pre class="programlisting">DB_INFO dbinfo;
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memset(dbinfo, 0, sizeof(dbinfo));
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dbinfo.db_cachesize = 1024 * 1024;</pre>
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<p>in the Berkeley DB 3.X releases, this should be done using the
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<a href="../api_reference/C/dbset_cachesize.html" class="olink">DB->set_cachesize()</a> method, as follows:</p>
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<pre class="programlisting">DB *db;
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int ret;
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ret = db->set_cachesize(db, 0, 1024 * 1024, 0);</pre>
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<p>The DB_INFO structure is no longer used in any way by the Berkeley DB 3.0
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release, and should be removed from the application.</p>
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<p>The following table lists the DB_INFO fields previously used by
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applications and the methods that should now be used to set
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them. Because these calls provide configuration for the
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database open, they must precede the call to <a href="../api_reference/C/dbopen.html" class="olink">DB->open()</a>.
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Calling them after the call to <a href="../api_reference/C/dbopen.html" class="olink">DB->open()</a> will return an
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error.</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>DB_INFO field</th>
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<th>Berkeley DB 3.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>bt_compare</td>
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<td>
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<a href="../api_reference/C/dbset_bt_compare.html" class="olink">DB->set_bt_compare()</a>
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</td>
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</tr>
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<tr>
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<td>bt_minkey</td>
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<td>
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<a href="../api_reference/C/dbset_bt_minkey.html" class="olink">DB->set_bt_minkey()</a>
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</td>
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</tr>
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<tr>
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<td>bt_prefix</td>
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<td>
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<a href="../api_reference/C/dbset_bt_prefix.html" class="olink">DB->set_bt_prefix()</a>
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</td>
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</tr>
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<tr>
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<td>db_cachesize</td>
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<td><a href="../api_reference/C/dbset_cachesize.html" class="olink">DB->set_cachesize()</a>
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<p>Note: the <a href="../api_reference/C/dbset_cachesize.html" class="olink">DB->set_cachesize()</a> function takes additional arguments.
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Setting both the second argument (the number of GB in the pool) and the
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last argument (the number of memory pools to create) to 0 will result in
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behavior that is backward-compatible with previous Berkeley DB releases.</p></td>
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</tr>
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<tr>
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<td>db_lorder</td>
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<td>
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<a href="../api_reference/C/dbset_lorder.html" class="olink">DB->set_lorder()</a>
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</td>
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</tr>
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<tr>
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<td>db_malloc</td>
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<td>DB->set_malloc</td>
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</tr>
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<tr>
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<td>db_pagesize</td>
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<td>
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<a href="../api_reference/C/dbset_pagesize.html" class="olink">DB->set_pagesize()</a>
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</td>
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</tr>
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<tr>
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<td>dup_compare</td>
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<td>
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<a href="../api_reference/C/dbset_dup_compare.html" class="olink">DB->set_dup_compare()</a>
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</td>
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</tr>
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<tr>
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<td>flags</td>
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<td><a href="../api_reference/C/dbset_flags.html" class="olink">DB->set_flags()</a>
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<p>Note: the DB_DELIMITER, DB_FIXEDLEN and DB_PAD flags no longer need to be
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set as there are specific methods off the <a href="../api_reference/C/db.html" class="olink">DB</a> handle that set the
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file delimiter, the length of fixed-length records and the fixed-length
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record pad character. They should simply be discarded from the application.</p></td>
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</tr>
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<tr>
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<td>h_ffactor</td>
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<td>
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<a href="../api_reference/C/dbset_h_ffactor.html" class="olink">DB->set_h_ffactor()</a>
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</td>
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</tr>
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<tr>
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<td>h_hash</td>
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<td>
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<a href="../api_reference/C/dbset_h_hash.html" class="olink">DB->set_h_hash()</a>
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</td>
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</tr>
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<tr>
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<td>h_nelem</td>
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<td>
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<a href="../api_reference/C/dbset_h_nelem.html" class="olink">DB->set_h_nelem()</a>
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</td>
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</tr>
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<tr>
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<td>re_delim</td>
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<td>
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<a href="../api_reference/C/dbset_re_delim.html" class="olink">DB->set_re_delim()</a>
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</td>
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</tr>
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<tr>
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<td>re_len</td>
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<td>
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<a href="../api_reference/C/dbset_re_len.html" class="olink">DB->set_re_len()</a>
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</td>
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</tr>
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<tr>
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<td>re_pad</td>
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<td>
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<a href="../api_reference/C/dbset_re_pad.html" class="olink">DB->set_re_pad()</a>
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</td>
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</tr>
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<tr>
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<td>re_source</td>
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<td>
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<a href="../api_reference/C/dbset_re_source.html" class="olink">DB->set_re_source()</a>
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</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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</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_0_db.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_3_0_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_0_join.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">DB structure </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->join</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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