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  • Committer: Bazaar Package Importer
  • Author(s): Didier Roche
  • Date: 2010-05-17 17:02:06 UTC
  • mfrom: (1.10.5 upstream)
  • mto: This revision was merged to the branch mainline in revision 128.
  • Revision ID: james.westby@ubuntu.com-20100517170206-xu1wmjuy40nt2sk0
Tags: upstream-2.30.1
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libdb/docs/ref/upgrade.3.0/dbinfo.html
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<!--$Id$-->
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<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: Release 3.0: the DBINFO structure</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<table width="100%"><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></h3></td>
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<td align=right><a href="../../ref/upgrade.3.0/db.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/upgrade.3.0/join.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>Release 3.0: the DBINFO structure</h1>
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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_c/db_class.html">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:
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<p><blockquote><pre>DB_INFO dbinfo;
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<p>
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        memset(dbinfo, 0, sizeof(dbinfo));
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        dbinfo.db_cachesize = 1024 * 1024;</pre></blockquote>
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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_c/db_set_cachesize.html">DB-&gt;set_cachesize</a> method, as follows:
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<p><blockquote><pre>DB *db;
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int ret;
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<p>
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        ret = db-&gt;set_cachesize(db, 0, 1024 * 1024, 0);</pre></blockquote>
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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.
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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_c/db_open.html">DB-&gt;open</a>.
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Calling them after the call to <a href="../../api_c/db_open.html">DB-&gt;open</a> will return an
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error.
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<p><table border=1 align=center>
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<tr><th>DB_INFO field</th><th>Berkeley DB 3.X method</th></tr>
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<tr><td>bt_compare</td><td><a href="../../api_c/db_set_bt_compare.html">DB-&gt;set_bt_compare</a></td></tr>
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<tr><td>bt_minkey</td><td><a href="../../api_c/db_set_bt_minkey.html">DB-&gt;set_bt_minkey</a></td></tr>
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<tr><td>bt_prefix</td><td><a href="../../api_c/db_set_bt_prefix.html">DB-&gt;set_bt_prefix</a></td></tr>
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<tr><td>db_cachesize</td><td><a href="../../api_c/db_set_cachesize.html">DB-&gt;set_cachesize</a>
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<p>Note: the <a href="../../api_c/db_set_cachesize.html">DB-&gt;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.</td></tr>
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<tr><td>db_lorder</td><td><a href="../../api_c/db_set_lorder.html">DB-&gt;set_lorder</a></td></tr>
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<tr><td>db_malloc</td><td>DB-&gt;set_malloc</td></tr>
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<tr><td>db_pagesize</td><td><a href="../../api_c/db_set_pagesize.html">DB-&gt;set_pagesize</a></td></tr>
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<tr><td>dup_compare</td><td><a href="../../api_c/db_set_dup_compare.html">DB-&gt;set_dup_compare</a></td></tr>
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<tr><td>flags</td><td><a href="../../api_c/db_set_flags.html">DB-&gt;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_c/db_class.html">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.</td></tr>
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<tr><td>h_ffactor</td><td><a href="../../api_c/db_set_h_ffactor.html">DB-&gt;set_h_ffactor</a></td></tr>
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<tr><td>h_hash</td><td><a href="../../api_c/db_set_h_hash.html">DB-&gt;set_h_hash</a></td></tr>
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<tr><td>h_nelem</td><td><a href="../../api_c/db_set_h_nelem.html">DB-&gt;set_h_nelem</a></td></tr>
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<tr><td>re_delim</td><td><a href="../../api_c/db_set_re_delim.html">DB-&gt;set_re_delim</a></td></tr>
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<tr><td>re_len</td><td><a href="../../api_c/db_set_re_len.html">DB-&gt;set_re_len</a></td></tr>
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<tr><td>re_pad</td><td><a href="../../api_c/db_set_re_pad.html">DB-&gt;set_re_pad</a></td></tr>
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<tr><td>re_source</td><td><a href="../../api_c/db_set_re_source.html">DB-&gt;set_re_source</a></td></tr>
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</table>
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<table width="100%"><tr><td><br></td><td align=right><a href="../../ref/upgrade.3.0/db.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/upgrade.3.0/join.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>