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	<title>Comments on: Choosing which database indexes to add</title>
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	<link>http://www.boost.co.nz/blog/ruby-on-rails/which-database-indexes-to-add/</link>
	<description>All the stuff we love - Web design &#124; Usability &#124; Ruby on Rails &#124; Agile and Scrum &#124; eLearing</description>
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		<title>By: jeremy</title>
		<link>http://www.boost.co.nz/blog/ruby-on-rails/which-database-indexes-to-add/comment-page-1/#comment-198</link>
		<dc:creator>jeremy</dc:creator>
		<pubDate>Tue, 29 Sep 2009 09:44:24 +0000</pubDate>
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		<description>Hi Rob. Index selectivity is a difficult one because the performance of an index might change as data fills the tables. It&#039;s good to be aware of it though. You can, I think, go way overboard in performance tuning the application and database. These things should be half thought about half reactive, otherwise we&#039;d never get any products actually launched.</description>
		<content:encoded><![CDATA[<p>Hi Rob. Index selectivity is a difficult one because the performance of an index might change as data fills the tables. It&#8217;s good to be aware of it though. You can, I think, go way overboard in performance tuning the application and database. These things should be half thought about half reactive, otherwise we&#8217;d never get any products actually launched.</p>
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		<title>By: Rob</title>
		<link>http://www.boost.co.nz/blog/ruby-on-rails/which-database-indexes-to-add/comment-page-1/#comment-197</link>
		<dc:creator>Rob</dc:creator>
		<pubDate>Tue, 29 Sep 2009 05:49:35 +0000</pubDate>
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		<description>Nice article. Might also want to touch on index selectivity. 
http://www.mysqlperformanceblog.com/2006/06/02/indexes-in-mysql/</description>
		<content:encoded><![CDATA[<p>Nice article. Might also want to touch on index selectivity.<br />
<a href="http://www.mysqlperformanceblog.com/2006/06/02/indexes-in-mysql/" rel="nofollow">http://www.mysqlperformanceblog.com/2006/06/02/indexes-in-mysql/</a></p>
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