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<! "@(#)bt_recnum.so 10.5 (Sleepycat) 10/20/98">
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<title>Berkeley DB Reference Guide: Access Methods</title>
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<h3>Berkeley DB Reference Guide: Access Methods</h3>
<p>
<h1 align=center>Retrieving Btree records by number (DB_RECNUM)</h1>
<p>
The Btree access method optionally supports retrieval by
<a href="../am/logrec.html">logical record number</a>. To configure a Btree
database for record numbers, set the <a href="../../api_c/DbInfo/info.html#DB_RECNUM">DB_RECNUM</a> flag in the
DB_INFO structure.
<p>
Configuring a Btree for record numbers should not be done lightly.
While useful, it introduces a severe hot-spot in the database when
storing key/data items, and can severely impact application throughput.
<p>
To retrieve by record number, use the <a href="../../api_c/Db/get.html#DB_SET_RECNO">DB_SET_RECNO</a> flag
to the <a href="../../api_c/Db/get.html">DB->get</a> and <a href="../../api_c/Dbc/get.html">DBcursor->c_get</a> interfaces.
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