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</div>
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<h1>Apache Lucene - Features</h1>
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<div id="minitoc-area">
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<ul class="minitoc">
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<li>
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<a href="#Features">Features</a>
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</li>
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<li>
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<a href="#Scalable, High-Performance Indexing">Scalable, High-Performance Indexing</a>
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</li>
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<li>
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<a href="#Powerful, Accurate and Efficient Search Algorithms">Powerful, Accurate and Efficient Search Algorithms</a>
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</li>
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<li>
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<a href="#Cross-Platform Solution">Cross-Platform Solution</a>
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</li>
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</ul>
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</div>
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<a name="N1000C"></a><a name="Features"></a>
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<h2 class="boxed">Features</h2>
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<div class="section">
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<p>Lucene offers powerful features through a simple API:</p>
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</div>
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<a name="N10015"></a><a name="Scalable, High-Performance Indexing"></a>
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<h2 class="boxed">Scalable, High-Performance Indexing</h2>
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<div class="section">
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<ul>
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<li>over 20MB/minute on Pentium M 1.5GHz<br>
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</li>
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<li>small RAM requirements -- only 1MB heap</li>
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<li>incremental indexing as fast as batch indexing</li>
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<li>index size roughly 20-30% the size of text indexed</li>
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</ul>
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</div>
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<a name="N1002B"></a><a name="Powerful, Accurate and Efficient Search Algorithms"></a>
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<h2 class="boxed">Powerful, Accurate and Efficient Search Algorithms</h2>
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<div class="section">
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<ul>
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<li>ranked searching -- best results returned first</li>
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<li>many powerful query types: phrase queries, wildcard queries, proximity
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queries, range queries and more</li>
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<li>fielded searching (e.g., title, author, contents)</li>
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<li>date-range searching</li>
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<li>sorting by any field</li>
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<li>multiple-index searching with merged results</li>
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<li>allows simultaneous update and searching</li>
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</ul>
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</div>
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<a name="N10049"></a><a name="Cross-Platform Solution"></a>
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<h2 class="boxed">Cross-Platform Solution</h2>
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<div class="section">
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<ul>
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<li>Available as Open Source software under the
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<a href="http://www.apache.org/licenses/LICENSE-2.0.html">Apache License</a>
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which lets you use Lucene in both commercial and Open Source programs</li>
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<li>100%-pure Java</li>
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<li>Implementations <a href="http://wiki.apache.org/lucene-java/LuceneImplementations">in other
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programming languages available</a> that are index-compatible</li>
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</ul>
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</div>
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Copyright ©
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2006 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
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