<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>No Class Index</title>
<link rel="stylesheet" type="text/css" href="../../../style.css">
</head>
<body>
<div class="CommonContent">
<div class="CommonContentArea">
<h1>No Class Index</h1><div id="TOC"><div id="TOCinner"><span class="TOCtitle">Contents</span><div class="TOCcontents"><ul><li><a href ="#Advantage">Advantage</a></li><li><a href ="#Effect">Effect</a></li><li><a href ="#Alternate Strategies">Alternate Strategies</a></li></ul></li></ul></div></div></div>
<span name="cs_wiki_filter" csw_filters="net"><p>.NET: </p>
<p><code>configuration.ObjectClass("namespace.classname,
assembly").Indexed(false);</code></p>
</span>
<p>Turns class index off.</p><a name="Advantage"></a><h2>Advantage</h2>
<p>Allows to improve the performance to delete
and create objects of a class. </p>
<a name="Effect"></a><h2>Effect</h2>
<p>db4o maintains an index for each class to be
able to deliver all instances of a class in a query. In some cases class index
is not necessary:</p>
<ul><li>the application always works with subclasses or superclasses;</li><li>there are convenient field indexes that will always find instances
of a class;</li><li>the application always works with IDs.</li></ul>
<p><code>Indexed(false)</code> setting will save
resources on maintaining the class index on create and delete of the class
objects.</p>
<a name="Alternate Strategies"></a><h2>Alternate Strategies</h2>
<p>Object creation performance can be improved using
<a href="calling_constructors.html" class="wikiLink">configuration.callConstructors(true)</a> setting.</p>
<p>General read/write performance can be improved with the
<a href="reserving_storage_space.html" class="wikiLink">configuration.reserveStorageSpace(byteCount)</a>
setting.</p>
</div>
</div>
<div id="footer">
This revision (4) was last Modified 2007-05-07T16:42:29 by Tetyana.
</div>
</body>
</html>
