lucene/docs/features.html

347 lines
9.8 KiB
HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta content="Apache Forrest" name="Generator">
<meta name="Forrest-version" content="0.8">
<meta name="Forrest-skin-name" content="pelt">
<title>Apache Lucene - Features</title>
<link type="text/css" href="skin/basic.css" rel="stylesheet">
<link media="screen" type="text/css" href="skin/screen.css" rel="stylesheet">
<link media="print" type="text/css" href="skin/print.css" rel="stylesheet">
<link type="text/css" href="skin/profile.css" rel="stylesheet">
<script src="skin/getBlank.js" language="javascript" type="text/javascript"></script><script src="skin/getMenu.js" language="javascript" type="text/javascript"></script><script src="skin/fontsize.js" language="javascript" type="text/javascript"></script>
<link rel="shortcut icon" href="images/favicon.ico">
</head>
<body onload="init()">
<script type="text/javascript">ndeSetTextSize();</script>
<div id="top">
<!--+
|breadtrail
+-->
<div class="breadtrail">
<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://lucene.apache.org/">Lucene</a><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script>
</div>
<!--+
|header
+-->
<div class="header">
<!--+
|start group logo
+-->
<div class="grouplogo">
<a href="http://lucene.apache.org/"><img class="logoImage" alt="Lucene" src="http://www.apache.org/images/asf_logo_simple.png" title="Apache Lucene"></a>
</div>
<!--+
|end group logo
+-->
<!--+
|start Project Logo
+-->
<div class="projectlogo">
<a href="http://lucene.apache.org/java/"><img class="logoImage" alt="Lucene" src="http://lucene.apache.org/images/lucene_green_300.gif" title="Apache Lucene is a high-performance, full-featured text search engine library written entirely in
Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform."></a>
</div>
<!--+
|end Project Logo
+-->
<!--+
|start Search
+-->
<div class="searchbox">
<form action="http://www.google.com/search" method="get" class="roundtopsmall">
<input value="lucene.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">&nbsp;
<input name="Search" value="Search" type="submit">
</form>
</div>
<!--+
|end search
+-->
<!--+
|start Tabs
+-->
<ul id="tabs">
<li class="current">
<a class="selected" href="index.html">Main</a>
</li>
<li>
<a class="unselected" href="http://wiki.apache.org/lucene-java">Wiki</a>
</li>
</ul>
<!--+
|end Tabs
+-->
</div>
</div>
<div id="main">
<div id="publishedStrip">
<!--+
|start Subtabs
+-->
<div id="level2tabs"></div>
<!--+
|end Endtabs
+-->
<script type="text/javascript"><!--
document.write("Last Published: " + document.lastModified);
// --></script>
</div>
<!--+
|breadtrail
+-->
<div class="breadtrail">
&nbsp;
</div>
<!--+
|start Menu, mainarea
+-->
<!--+
|start Menu
+-->
<div id="menu">
<div onclick="SwitchMenu('menu_selected_1.1', 'skin/')" id="menu_selected_1.1Title" class="menutitle" style="background-image: url('skin/images/chapter_open.gif');">About</div>
<div id="menu_selected_1.1" class="selectedmenuitemgroup" style="display: block;">
<div class="menuitem">
<a href="index.html" title="Welcome to Java Lucene">Overview</a>
</div>
<div class="menupage">
<div class="menupagetitle">Features</div>
</div>
<div class="menuitem">
<a href="http://wiki.apache.org/lucene-java/PoweredBy">Powered by Lucene</a>
</div>
<div class="menuitem">
<a href="whoweare.html">Who We Are</a>
</div>
</div>
<div onclick="SwitchMenu('menu_1.2', 'skin/')" id="menu_1.2Title" class="menutitle">Documentation</div>
<div id="menu_1.2" class="menuitemgroup">
<div class="menuitem">
<a href="api/index.html">API Docs</a>
</div>
<div class="menuitem">
<a href="benchmarks.html">Benchmarks</a>
</div>
<div class="menuitem">
<a href="contributions.html">Contributions</a>
</div>
<div class="menuitem">
<a href="http://wiki.apache.org/lucene-java/LuceneFAQ">FAQ</a>
</div>
<div class="menuitem">
<a href="fileformats.html">File Formats</a>
</div>
<div class="menuitem">
<a href="gettingstarted.html">Getting Started</a>
</div>
<div class="menuitem">
<a href="lucene-sandbox/index.html">Lucene Sandbox</a>
</div>
<div class="menuitem">
<a href="queryparsersyntax.html">Query Syntax</a>
</div>
<div class="menuitem">
<a href="scoring.html">Scoring</a>
</div>
<div class="menuitem">
<a href="http://wiki.apache.org/lucene-java">Wiki</a>
</div>
</div>
<div onclick="SwitchMenu('menu_1.3', 'skin/')" id="menu_1.3Title" class="menutitle">Resources</div>
<div id="menu_1.3" class="menuitemgroup">
<div class="menuitem">
<a href="developer-resources.html">Developers</a>
</div>
<div class="menuitem">
<a href="http://issues.apache.org/jira/browse/LUCENE">Issue Tracking</a>
</div>
<div class="menuitem">
<a href="mailinglists.html">Mailing Lists</a>
</div>
<div class="menuitem">
<a href="releases.html">Releases</a>
</div>
<div class="menuitem">
<a href="systemrequirements.html">System Requirements</a>
</div>
<div class="menuitem">
<a href="http://svn.apache.org/viewcvs.cgi/lucene/java/">Version Control</a>
</div>
</div>
<div onclick="SwitchMenu('menu_1.4', 'skin/')" id="menu_1.4Title" class="menutitle">Site Versions</div>
<div id="menu_1.4" class="menuitemgroup">
<div class="menuitem">
<a href="./">Main</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/java/1_4_3/">1.4.3</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/java/1_9_0/">1.9.0</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/java/1_9_1/">1.9.1</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/java/2_0_0/">2.0.0</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/java/2_1_0/">2.1.0</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/java/2_2_0/">2.2.0</a>
</div>
</div>
<div onclick="SwitchMenu('menu_1.5', 'skin/')" id="menu_1.5Title" class="menutitle">Related Projects</div>
<div id="menu_1.5" class="menuitemgroup">
<div class="menuitem">
<a href="http://lucene.apache.org">Lucene (Top-Level)</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/hadoop/">Hadoop</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/lucy/">Lucy</a>
</div>
<div class="menuitem">
<a href="http://incubator.apache.org/projects/lucene.net.html">Lucene.Net</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/nutch/">Nutch</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/solr/">SOLR</a>
</div>
</div>
<div id="credit"></div>
<div id="roundbottom">
<img style="display: none" class="corner" height="15" width="15" alt="" src="skin/images/rc-b-l-15-1body-2menu-3menu.png"></div>
<!--+
|alternative credits
+-->
<div id="credit2"></div>
</div>
<!--+
|end Menu
+-->
<!--+
|start content
+-->
<div id="content">
<div title="Portable Document Format" class="pdflink">
<a class="dida" href="features.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
PDF</a>
</div>
<h1>Apache Lucene - Features</h1>
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#Features">Features</a>
</li>
<li>
<a href="#Scalable, High-Performance Indexing">Scalable, High-Performance Indexing</a>
</li>
<li>
<a href="#Powerful, Accurate and Efficient Search Algorithms">Powerful, Accurate and Efficient Search Algorithms</a>
</li>
<li>
<a href="#Cross-Platform Solution">Cross-Platform Solution</a>
</li>
</ul>
</div>
<a name="N1000C"></a><a name="Features"></a>
<h2 class="boxed">Features</h2>
<div class="section">
<p>Lucene offers powerful features through a simple API:</p>
</div>
<a name="N10015"></a><a name="Scalable, High-Performance Indexing"></a>
<h2 class="boxed">Scalable, High-Performance Indexing</h2>
<div class="section">
<ul>
<li>over 20MB/minute on Pentium M 1.5GHz<br>
</li>
<li>small RAM requirements -- only 1MB heap</li>
<li>incremental indexing as fast as batch indexing</li>
<li>index size roughly 20-30% the size of text indexed</li>
</ul>
</div>
<a name="N1002B"></a><a name="Powerful, Accurate and Efficient Search Algorithms"></a>
<h2 class="boxed">Powerful, Accurate and Efficient Search Algorithms</h2>
<div class="section">
<ul>
<li>ranked searching -- best results returned first</li>
<li>many powerful query types: phrase queries, wildcard queries, proximity
queries, range queries and more</li>
<li>fielded searching (e.g., title, author, contents)</li>
<li>date-range searching</li>
<li>sorting by any field</li>
<li>multiple-index searching with merged results</li>
<li>allows simultaneous update and searching</li>
</ul>
</div>
<a name="N10049"></a><a name="Cross-Platform Solution"></a>
<h2 class="boxed">Cross-Platform Solution</h2>
<div class="section">
<ul>
<li>Available as Open Source software under the
<a href="http://www.apache.org/licenses/LICENSE-2.0.html">Apache License</a>
which lets you use Lucene in both commercial and Open Source programs</li>
<li>100%-pure Java</li>
<li>Implementations <a href="http://wiki.apache.org/lucene-java/LuceneImplementations">in other
programming languages available</a> that are index-compatible</li>
</ul>
</div>
</div>
<!--+
|end content
+-->
<div class="clearboth">&nbsp;</div>
</div>
<div id="footer">
<!--+
|start bottomstrip
+-->
<div class="lastmodified">
<script type="text/javascript"><!--
document.write("Last Published: " + document.lastModified);
// --></script>
</div>
<div class="copyright">
Copyright &copy;
2006 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
</div>
<!--+
|end bottomstrip
+-->
</div>
</body>
</html>