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lib-src/redland/docs/html/redland-storage-module-hashes.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Store 'hashes'</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2">
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<link rel="start" href="index.html" title="Redland RDF Library Manual">
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<link rel="up" href="redland-storage-modules.html" title="Storage Modules">
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<link rel="prev" href="redland-storage-modules.html" title="Storage Modules">
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<link rel="chapter" href="redland.html" title="Redland Overview">
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<link rel="chapter" href="introduction.html" title="Introduction">
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<link rel="part" href="tutorial.html" title="Part I. Tutorial">
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<link rel="part" href="reference-manual.html" title="Part II. Reference Manual">
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<link rel="chapter" href="objects.html" title="Objects in C">
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<link rel="chapter" href="redland-storage-modules.html" title="Storage Modules">
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<link rel="index" href="indexes.html" title="Index">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle">
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<th width="100%" align="center">Redland RDF Library Manual</th>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="redland-storage-module-hashes"></a>Store 'hashes'</h2></div></div></div>
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<p>This module is always present (cannot be removed) and provides
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indexed storage using Redland <a class="xref" href="redland-storage.html" title="Triple stores."><span class="refentrytitle"><a name="redland-storage.top_of_page"></a>Triple stores.</span>(3)</a> to
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store various combinations of subject, predicate and object for
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faster access. Context nodes are also stored in a hash when used.
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The hashes may be in-memory (always availabe) or persistent via
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Sleepycat/Berkeley DB (BDB) versions 2-4. It is the most mature and
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primary persistent store and suitable for large models, tested in the
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2-3 million range..</p>
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<p>The main option requiring setting is the
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<code class="literal">hash-type</code> which must be one of the supported
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Redland hashes. Hash type <code class="literal">memory</code> is always
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available and if BDB has been compiled in, <code class="literal">bdb</code> is
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also available. Option <code class="literal">dir</code> can be used to set the
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destination directory for the BDB files when used. Boolean option
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<code class="literal">new</code> can be set to force creation or truncation
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of a persistent hashed store. The storage
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name must be given for hash type <code class="literal">bdb</code> since
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it is used for a filename.
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</p>
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<p>The module provides optional contexts support enabled when
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boolean storage option <code class="literal">contexts</code> is set. This
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can be used with any hash type.</p>
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<p>Examples:</p>
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<pre class="programlisting">
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/* A new BDB hashed persistent store in the current directory */
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storage=librdf_new_storage(world, "hashes", "db1",
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"new='yes',hash-type='bdb',dir='.'");
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/* Hashed in-memory store */
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storage=librdf_new_storage(world, "hashes", NULL,
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"hash-type='memory'");
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/* An existing BDB hashed persistent store in dir /somewhere */
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storage=librdf_new_storage(world, "hashes", "dv2",
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"hash-type='bdb',dir='/somewhere'");
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/* An existing BDB hashed store with contexts */
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storage=librdf_new_storage(world, "hashes", "db3",
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"hash-type='bdb',contexts='yes'");
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</pre>
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<p>In Python:</p>
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<pre class="programlisting">
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from RDF import *
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...
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# Create a new BDB store
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storage = HashStorage("db4", options="new='yes',hash-type='bdb'")
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</pre>
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<p>In Perl:</p>
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<pre class="programlisting">
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use RDF::Redland;
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...
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# Open an existing BDB store
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$storage=new RDF::Redland::Storage("hashes", "db5",
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"hash-type='bdb',dir='.'");
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</pre>
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<p>Summary:</p>
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<div class="itemizedlist"><ul type="disc">
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<li><p>Persistent or in-memory</p></li>
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<li><p>Suitable for larger models</p></li>
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<li><p>Indexed</p></li>
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<li><p>Large disk usage with BDB</p></li>
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<li><p>Optional contexts (with option <code class="literal">contexts</code> set)</p></li>
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</ul></div>
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</div>
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<div class="footer">
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<hr>
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Generated by GTK-Doc V1.10</div>
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