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  • Committer: Bazaar Package Importer
  • Author(s): Joey Hess
  • Date: 2002-01-22 20:56:57 UTC
  • Revision ID: james.westby@ubuntu.com-20020122205657-l74j50mr9z8ofcl5
Tags: upstream-4.0.3
Import upstream version 4.0.3

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db/docs/ref/am_conf/h_nelem.html
 
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<!--$Id: h_nelem.so,v 10.12 2000/03/18 21:43:08 bostic Exp $-->
 
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<!--Copyright 1997-2001 by Sleepycat Software, Inc.-->
 
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<!--All rights reserved.-->
 
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<html>
 
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<head>
 
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<title>Berkeley DB Reference Guide: Hash table size</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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<a name="2"><!--meow--></a>
 
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<table width="100%"><tr valign=top>
 
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Access Methods</dl></h3></td>
 
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<td align=right><a href="../../ref/am_conf/h_hash.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/am_conf/recno.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>Hash table size</h1>
 
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<p>When setting up the hash database, knowing the expected number of elements
 
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that will be stored in the hash table is useful.  This value can be used
 
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by the Hash access method implementation to more accurately construct the
 
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necessary number of buckets that the database will eventually require.
 
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<p>The anticipated number of elements in the hash table can be specified by
 
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calling the <a href="../../api_c/db_set_h_nelem.html">DB-&gt;set_h_nelem</a> function.  If not specified, or set too low,
 
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hash tables will expand gracefully as keys are entered, although a slight
 
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performance degradation may be noticed.  In order for the estimated number
 
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of elements to be a useful value to Berkeley DB, the <a href="../../api_c/db_set_h_ffactor.html">DB-&gt;set_h_ffactor</a> function
 
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must also be called to set the page fill factor.
 
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<table width="100%"><tr><td><br></td><td align=right><a href="../../ref/am_conf/h_hash.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/am_conf/recno.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>