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From Computerworld, Inc.]
April 21, 2008 (Computerworld) Databases are getting faster every day. But they're still a significant bottleneck for many Web applications or Web sites.
Why? Mechanical hard drives, impeded by the laws of physics, bog down the relational databases that read and write to them.
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http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9079178&intsrc=hm_list