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90 lines
5.5 KiB
HTML
90 lines
5.5 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>DB->stat</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_1_toc.html" title="Chapter 13. Upgrading Berkeley DB 3.0 applications to Berkeley DB 3.1" />
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<link rel="prev" href="upgrade_3_1_dup.html" title="identical duplicate data items" />
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<link rel="next" href="upgrade_3_1_sysmem.html" title="DB_SYSTEM_MEM" />
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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">DB->stat</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_1_dup.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 13. Upgrading Berkeley DB 3.0 applications to Berkeley DB 3.1</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_1_sysmem.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_1_btstat"></a>DB->stat</h2>
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</div>
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</div>
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</div>
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<p>For Btree database statistics, the <a href="../api_reference/C/dbstat.html" class="olink">DB->stat()</a> method field
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<span class="bold"><strong>bt_nrecs</strong></span> has been removed, replaced by two fields:
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<span class="bold"><strong>bt_nkeys</strong></span> and <span class="bold"><strong>bt_ndata</strong></span>. The <span class="bold"><strong>bt_nkeys</strong></span> field returns
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a count of the unique keys in the database. The <span class="bold"><strong>bt_ndata</strong></span> field
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returns a count of the key/data pairs in the database. Neither exactly
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matches the previous value of the <span class="bold"><strong>bt_nrecs</strong></span> field, which returned
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a count of keys in the database, but, in the case of Btree databases,
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could overcount as it sometimes counted duplicate data items as unique
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keys. The application should be searched for any uses of the
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<span class="bold"><strong>bt_nrecs</strong></span> field and the field should be changed to be either
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<span class="bold"><strong>bt_nkeys</strong></span> or <span class="bold"><strong>bt_ndata</strong></span>, whichever is more appropriate.</p>
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<p>For Hash database statistics, the <a href="../api_reference/C/dbstat.html" class="olink">DB->stat()</a> method field
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<span class="bold"><strong>hash_nrecs</strong></span> has been removed, replaced by two fields:
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<span class="bold"><strong>hash_nkeys</strong></span> and <span class="bold"><strong>hash_ndata</strong></span>. The <span class="bold"><strong>hash_nkeys</strong></span> field
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returns a count of the unique keys in the database. The
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<span class="bold"><strong>hash_ndata</strong></span> field returns a count of the key/data pairs in the
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database. The new <span class="bold"><strong>hash_nkeys</strong></span> field exactly matches the previous
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value of the <span class="bold"><strong>hash_nrecs</strong></span> field. The application should be
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searched for any uses of the <span class="bold"><strong>hash_nrecs</strong></span> field, and the field
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should be changed to be <span class="bold"><strong>hash_nkeys</strong></span>.</p>
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<p>For Queue database statistics, the <a href="../api_reference/C/dbstat.html" class="olink">DB->stat()</a> method field
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<span class="bold"><strong>qs_nrecs</strong></span> has been removed, replaced by two fields:
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<span class="bold"><strong>qs_nkeys</strong></span> and <span class="bold"><strong>qs_ndata</strong></span>. The <span class="bold"><strong>qs_nkeys</strong></span> field returns
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a count of the unique keys in the database. The <span class="bold"><strong>qs_ndata</strong></span> field
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returns a count of the key/data pairs in the database. The new
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<span class="bold"><strong>qs_nkeys</strong></span> field exactly matches the previous value of the
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<span class="bold"><strong>qs_nrecs</strong></span> field. The application should be searched for any uses
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of the <span class="bold"><strong>qs_nrecs</strong></span> field, and the field should be changed to be
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<span class="bold"><strong>qs_nkeys</strong></span>.</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_1_dup.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_3_1_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_1_sysmem.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">identical duplicate data items </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_SYSTEM_MEM</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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