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<!--$Id: btstat.so,v 1.12 2003/10/18 19:16:15 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Release 3.1: DB->stat</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td><b><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></b></td> <td align=right><a href="../upgrade.3.1/dup.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../upgrade.3.1/sysmem.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p align=center><b>Release 3.1: DB->stat</b></p> <p>For Btree database statistics, the <a href="../../api_c/db_stat.html">DB->stat</a> method field <b>bt_nrecs</b> has been removed, replaced by two fields: <b>bt_nkeys</b> and <b>bt_ndata</b>. The <b>bt_nkeys</b> field returns a count of the unique keys in the database. The <b>bt_ndata</b> field returns a count of the key/data pairs in the database. Neither exactly matches the previous value of the <b>bt_nrecs</b> field, which returned a count of keys in the database, but, in the case of Btree databases, could overcount as it sometimes counted duplicate data items as unique keys. The application should be searched for any uses of the <b>bt_nrecs</b> field and the field should be changed to be either <b>bt_nkeys</b> or <b>bt_ndata</b>, whichever is more appropriate.</p> <p>For Hash database statistics, the <a href="../../api_c/db_stat.html">DB->stat</a> method field <b>hash_nrecs</b> has been removed, replaced by two fields: <b>hash_nkeys</b> and <b>hash_ndata</b>. The <b>hash_nkeys</b> field returns a count of the unique keys in the database. The <b>hash_ndata</b> field returns a count of the key/data pairs in the database. The new <b>hash_nkeys</b> field exactly matches the previous value of the <b>hash_nrecs</b> field. The application should be searched for any uses of the <b>hash_nrecs</b> field, and the field should be changed to be <b>hash_nkeys</b>.</p> <p>For Queue database statistics, the <a href="../../api_c/db_stat.html">DB->stat</a> method field <b>qs_nrecs</b> has been removed, replaced by two fields: <b>qs_nkeys</b> and <b>qs_ndata</b>. The <b>qs_nkeys</b> field returns a count of the unique keys in the database. The <b>qs_ndata</b> field returns a count of the key/data pairs in the database. The new <b>qs_nkeys</b> field exactly matches the previous value of the <b>qs_nrecs</b> field. The application should be searched for any uses of the <b>qs_nrecs</b> field, and the field should be changed to be <b>qs_nkeys</b>.</p> <table width="100%"><tr><td><br></td><td align=right><a href="../upgrade.3.1/dup.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../upgrade.3.1/sysmem.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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