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<![endif]--><script type="text/javascript" src="common/browserDetect.js"></script><script type="text/javascript" src="common/jquery/jquery-1.7.2.min.js"></script><script type="text/javascript" src="common/jquery/jquery.ui.all.js"></script><script type="text/javascript" src="common/jquery/jquery.cookie.js"></script><script type="text/javascript" src="common/jquery/treeview/jquery.treeview.min.js"></script><script type="text/javascript" src="common/jquery/layout/jquery.layout.js"></script><script type="text/javascript" src="search/l10n.js"></script><script type="text/javascript" src="search/htmlFileInfoList.js"></script><script type="text/javascript" src="search/nwSearchFnt.js"></script><script type="text/javascript" src="search/stemmers/en_stemmer.js"><!--//make this scalable to other languages as well.--></script><script type="text/javascript" src="search/index-1.js"></script><script type="text/javascript" src="search/index-2.js"></script><script type="text/javascript" src="search/index-3.js"></script></head><body><noscript><div id="noscript">JavaScript is disabled on your browser. Please enable JavaScript to enjoy all the features of this site.</div></noscript><div id="header"><a href="index.html"><img style="margin-right: 2px; height: 59px; padding-right: 25px; padding-top: 8px" align="right" src="common/images/logo.png" alt=" Documentation"></img></a><h1>Recoll user manual<br></br>Indexing</h1><div id="navheader"><table class="navLinks"><tr><td><a id="showHideButton" href="#" onclick="myLayout.toggle('west')" class="pointLeft" tabindex="5" title="Hide TOC tree">Sidebar
</a></td><td><a accesskey="p" class="navLinkPrevious" tabindex="5" href="ch02s01s05.html">Prev</a>
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<a accesskey="n" class="navLinkNext" tabindex="5" href="RCL.INDEXING.STORAGE.FORMAT.html">Next</a></td></tr></table></div></div><div id="content"><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="RCL.INDEXING.STORAGE"></a>Index storage</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="RCL.INDEXING.STORAGE.FORMAT.html"><span class="application">Xapian</span> index formats</a></span></dt><dt><span class="sect2"><a href="RCL.INDEXING.STORAGE.SECURITY.html">Security aspects</a></span></dt></dl></div><p>The default location for the index data is the
<code class="filename">xapiandb</code> subdirectory of the <span class="application">Recoll</span>
configuration directory, typically
<code class="filename">$HOME/.recoll/xapiandb/</code>. This can be
changed via two different methods (with different purposes):
</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>You can specify a different configuration
directory by setting the <code class="envar">RECOLL_CONFDIR</code>
environment variable, or using the <code class="option">-c</code>
option to the <span class="application">Recoll</span> commands. This method would typically be
used to index different areas of the file system to
different indexes. For example, if you were to issue the
following command:
</p><pre class="programlisting">recoll -c ~/.indexes-email</pre><p> Then
<span class="application">Recoll</span> would use configuration files
stored in <code class="filename">~/.indexes-email/</code> and,
(unless specified otherwise in
<code class="filename">recoll.conf</code>) would look for
the index in
<code class="filename">~/.indexes-email/xapiandb/</code>.</p><p>Using multiple configuration directories and <a class="link" href="RCL.INSTALL.CONFIG.RECOLLCONF.html" title="The main configuration file, recoll.conf">configuration
options</a> allows you to tailor multiple configurations and
indexes to handle whatever subset of the available data you wish
to make searchable.</p></li><li class="listitem"><p>For a given configuration directory, you can
specify a non-default storage location for the index by setting
the <code class="varname">dbdir</code> parameter in the configuration file
(see the <a class="link" href="RCL.INSTALL.CONFIG.RECOLLCONF.html" title="The main configuration file, recoll.conf">configuration
section</a>). This method would mainly be of use if you wanted
to keep the configuration directory in its default location, but
desired another location for the index, typically out of disk
occupation concerns.</p></li></ul></div><p>
</p><p>The size of the index is determined by the size of the set
of documents, but the ratio can vary a lot. For a typical
mixed set of documents, the index size will often be close to
the data set size. In specific cases (a set of compressed mbox
files for example), the index can become much bigger than the
documents. It may also be much smaller if the documents
contain a lot of images or other non-indexed data (an extreme
example being a set of mp3 files where only the tags would be
indexed).</p><p>Of course, images, sound and video do not increase the
index size, which means that nowadays (2012), typically, even a big
index will be negligible against the total amount of data on the
computer.</p><p>The index data directory (<code class="filename">xapiandb</code>)
only contains data that can be completely rebuilt by an index run
(as long as the original documents exist), and it can always be
destroyed safely.</p></div><script type="text/javascript" src="common/main.js"></script><script type="text/javascript" src="common/splitterInit.js"></script><div class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02s01s05.html">Prev</a>��</td><td width="20%" align="center"><a accesskey="u" href="RCL.INDEXING.html">Up</a></td><td width="40%" align="right">��<a accesskey="n" href="RCL.INDEXING.STORAGE.FORMAT.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">��</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">��</td></tr></table></div></div><div id="sidebar"><div id="leftnavigation" style="padding-top:3px;"><div id="tabs"><ul><li><a href="#treeDiv" style="outline:0;" tabindex="1"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv" style="outline:0;" tabindex="1" onclick="doSearch()"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="common/images/loading.gif" alt="loading table of contents..." id="tocLoading" style="display:block;"></img><div id="ulTreeDiv" style="display:none"><ul id="tree" class="filetree"><li><span class="file"><a href="RCL.INTRODUCTION.html" tabindex="1">Introduction</a></span><ul><li><span class="file"><a href="RCL.INTRODUCTION.TRYIT.html" tabindex="1">Giving it a try</a></span></li><li><span class="file"><a href="RCL.INTRODUCTION.SEARCH.html" tabindex="1">Full text search</a></span></li><li><span class="file"><a href="RCL.INTRODUCTION.RECOLL.html" tabindex="1">Recoll overview</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.html" tabindex="1">Indexing</a></span><ul><li><span class="file"><a href="RCL.INDEXING.INTRODUCTION.html" tabindex="1">Introduction</a></span><ul><li><span class="file"><a href="RCL.INDEXING.INTRODUCTION.MODES.html" tabindex="1">Indexing modes</a></span></li><li><span class="file"><a href="RCL.INDEXING.INTRODUCTION.CONFIG.html" tabindex="1">Configurations, multiple indexes</a></span></li><li><span class="file"><a href="ch02s01s03.html" tabindex="1">Document types</a></span></li><li><span class="file"><a href="ch02s01s04.html" tabindex="1">Indexing failures</a></span></li><li><span class="file"><a href="ch02s01s05.html" tabindex="1">Recovery</a></span></li></ul></li><li id="webhelp-currentid"><span class="file"><a href="RCL.INDEXING.STORAGE.html" tabindex="1">Index storage</a></span><ul><li><span class="file"><a href="RCL.INDEXING.STORAGE.FORMAT.html" tabindex="1">Xapian index formats</a></span></li><li><span class="file"><a href="RCL.INDEXING.STORAGE.SECURITY.html" tabindex="1">Security aspects</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.CONFIG.html" tabindex="1">Index configuration</a></span><ul><li><span class="file"><a href="RCL.INDEXING.CONFIG.MULTIPLE.html" tabindex="1">Multiple indexes</a></span></li><li><span class="file"><a href="RCL.INDEXING.CONFIG.SENS.html" tabindex="1">Index case and diacritics sensitivity</a></span></li><li><span class="file"><a href="RCL.INDEXING.CONFIG.GUI.html" tabindex="1">The index configuration GUI</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.WEBQUEUE.html" tabindex="1">Indexing WEB pages you wisit</a></span></li><li><span class="file"><a href="RCL.INDEXING.EXTATTR.html" tabindex="1">Extended attributes data</a></span></li><li><span class="file"><a href="RCL.INDEXING.EXTTAGS.html" tabindex="1">Importing external tags</a></span></li><li><span class="file"><a href="RCL.INDEXING.PERIODIC.html" tabindex="1">Periodic indexing</a></span><ul><li><span class="file"><a href="RCL.INDEXING.PERIODIC.EXEC.html" tabindex="1">Running indexing</a></span></li><li><span class="file"><a href="RCL.INDEXING.PERIODIC.AUTOMAT.html" tabindex="1">Using cron to automate
indexing</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.MONITOR.html" tabindex="1">Real time indexing</a></span><ul><li><span class="file"><a href="RCL.INDEXING.MONITOR.FASTFILES.html" tabindex="1">Slowing down the reindexing rate for fast changing
files</a></span></li></ul></li></ul></li><li><span class="file"><a href="RCL.SEARCH.html" tabindex="1">Searching</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.html" tabindex="1">Searching with the Qt graphical user interface</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.SIMPLE.html" tabindex="1">Simple search</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.RESLIST.html" tabindex="1">The default result list</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.RESLIST.SUGGS.html" tabindex="1">No results: the spelling suggestions</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.RESULTLIST.MENU.html" tabindex="1">The result list right-click menu</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.GUI.RESTABLE.html" tabindex="1">The result table</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.RUNSCRIPT.html" tabindex="1">Running arbitrary commands on result files (1.20 and later)</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.THUMBNAILS.html" tabindex="1">Displaying thumbnails</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.PREVIEW.html" tabindex="1">The preview window</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.PREVIEW.SEARCH.html" tabindex="1">Searching inside the preview</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.GUI.FRAGBUTS.html" tabindex="1">The Query Fragments window</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.html" tabindex="1">Complex/advanced search</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.TERMS.html" tabindex="1">Avanced search: the "find" tab</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.FILTER.html" tabindex="1">Avanced search: the "filter" tab</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.HISTORY.html" tabindex="1">Avanced search 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href="RCL.SEARCH.SAVING.html" tabindex="1">Saving and restoring queries (1.21 and later)</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.CUSTOM.html" tabindex="1">Customizing the search interface</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.CUSTOM.RESLIST.html" tabindex="1">The result list format</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.CUSTOM.RESLIST.html#RCL.SEARCH.GUI.CUSTOM.RESLIST.PARA" tabindex="1">The paragraph format</a></span></li></ul></li></ul></li></ul></li><li><span class="file"><a href="RCL.SEARCH.KIO.html" tabindex="1">Searching with the KDE KIO slave</a></span><ul><li><span class="file"><a href="RCL.SEARCH.KIO.INTRO.html" tabindex="1">What's this</a></span></li><li><span class="file"><a href="RCL.SEARCH.KIO.SEARCHABLEDOCS.html" tabindex="1">Searchable documents</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.COMMANDLINE.html" tabindex="1">Searching on the command line</a></span></li><li><span class="file"><a href="RCL.SEARCH.SYNONYMS.html" tabindex="1">Using Synonyms (Recoll 1.22 and later)</a></span></li><li><span class="file"><a href="RCL.SEARCH.PTRANS.html" tabindex="1">Path translations</a></span></li><li><span class="file"><a href="RCL.SEARCH.LANG.html" tabindex="1">The query language</a></span><ul><li><span class="file"><a href="RCL.SEARCH.LANG.MODIFIERS.html" tabindex="1">Modifiers</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.CASEDIAC.html" tabindex="1">Search case and diacritics sensitivity</a></span></li><li><span class="file"><a href="RCL.SEARCH.ANCHORWILD.html" tabindex="1">Anchored searches and wildcards</a></span><ul><li><span class="file"><a href="RCL.SEARCH.WILDCARDS.html" tabindex="1">More about wildcards</a></span><ul><li><span class="file"><a href="RCL.SEARCH.WILDCARDS.PATH.html" tabindex="1">Wildcards and path filtering</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.ANCHOR.html" tabindex="1">Anchored 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