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Viewing changes to libdb/docs/ref/am_conf/h_ffactor.html

  • Committer: Bazaar Package Importer
  • Author(s): Didier Roche
  • Date: 2010-05-17 17:02:06 UTC
  • mfrom: (1.1.79 upstream) (1.6.12 experimental)
  • Revision ID: james.westby@ubuntu.com-20100517170206-4ufr52vwrhh26yh0
Tags: 2.30.1-1ubuntu1
https://launchpad.net/bugs/42199
https://launchpad.net/bugs/229669
https://launchpad.net/bugs/173703
https://launchpad.net/bugs/360344
https://launchpad.net/bugs/508494
* Merge from debian experimental. Remaining change:
  (LP: #42199, #229669, #173703, #360344, #508494)
  + debian/control:
    - add Vcs-Bzr tag
    - don't use libgnome
    - Use Breaks instead of Conflicts against evolution 2.25 and earlier.
  + debian/evolution-data-server.install,
    debian/patches/45_libcamel_providers_version.patch:
    - use the upstream versioning, not a Debian-specific one 
  + debian/libedata-book1.2-dev.install, debian/libebackend-1.2-dev.install,
    debian/libcamel1.2-dev.install, debian/libedataserverui1.2-dev.install:
    - install html documentation
  + debian/rules:
    - don't build documentation it's shipped with the tarball

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libdb/docs/ref/am_conf/h_ffactor.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: Page fill factor</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/bt_recnum.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/h_hash.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>Page fill factor</h1>
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<p>The density, or page fill factor, is an approximation of the number of
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keys allowed to accumulate in any one bucket, determining when the hash
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table grows or shrinks.  If you know the average sizes of the keys and
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data in your data set, setting the fill factor can enhance performance.
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A reasonable rule to use to compute fill factor is:
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<p><blockquote><pre>(pagesize - 32) / (average_key_size + average_data_size + 8)</pre></blockquote>
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<p>The desired density within the hash table can be specified by calling
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the <a href="../../api_c/db_set_h_ffactor.html">DB-&gt;set_h_ffactor</a> method.  If no density is specified, one will
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be selected dynamically as pages are filled.
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<table width="100%"><tr><td><br></td><td align=right><a href="../../ref/am_conf/bt_recnum.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/h_hash.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>