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One caution: I discovered a bug in MySQL, which I logged as Optimizer does table scan for select count(*) w/5.1.22, .23, not 5.0.51, 5.1.11. You will encounter this bug if you follow the instructions in my magazine article. The work-around is to use MySQL 5.0.51a instead of 5.1.22, as shown in the magazine.
Dru Lavigne does a nice job detailing the magazine's table of contents.
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