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Dockes</holder> Dockes</holder>
</copyright> </copyright>
<releaseinfo>$Id: usermanual.sgml,v 1.42 2007-05-21 07:24:14 dockes Exp $</releaseinfo> <releaseinfo>$Id: usermanual.sgml,v 1.43 2007-05-30 12:30:55 dockes Exp $</releaseinfo>
<abstract> <abstract>
<para>This document introduces full text search notions <para>This document introduces full text search notions
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only contains data that can be completely rebuilt by an index only contains data that can be completely rebuilt by an index
run, and it can always be destroyed safely.</para> run, and it can always be destroyed safely.</para>
<sect2 id="rcl.indexing.storage.format">
<title>Index formats</title>
<para>&XAP; has had two possible index formats for quite some
time. The "old" one named <literal>Quartz</literal>, and the
new one named <literal>Flint</literal>. &XAP; 0.9 used
<literal>Quartz</literal> by default, but could use
<literal>Flint</literal> if a specific environment variable
(<literal>XAPIAN_PREFER_FLINT</literal>) was set. &XAP; 1.0
still supports <literal>Quartz</literal> but will use
<literal>Flint</literal> by default for new index
creations.</para>
<para>The number of disk accesses performed during indexing
has been much optimized in the new <literal>Flint</literal>
engine and you may see indexing times improved by 50% in some
cases (compared to <literal>Quartz</literal>), typically for
big indexes where disk accesses dominate the indexing
time. There is also a more modest improvement of index
size.</para>
<para>&XAP; will not convert automatically an existing index
from the <literal>Quartz</literal> to the
<literal>Flint</literal> format. If you have an older index
and want to take advantage of the new format (which can be
done without setting the environment variable as of &RCL;
1.8.2 and &XAP; 1.0.0), you will have to explicitely delete
the old index, then run a normal indexing process.</para>
<para>Unfortunately, using the <literal>-z</literal> option to
<command>recollindex</command> is not sufficient to change the
format, you have to delete all files inside the index
directory (typically <filename>~/.recoll/xapiandb</filename>)
before starting indexing.</para>
</sect2>
<sect2 id="rcl.indexing.storage.security"> <sect2 id="rcl.indexing.storage.security">
<title>Security aspects</title> <title>Security aspects</title>