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sort_buffer_size and Knowing Why
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In How to tune MySQL’s sort_buffer_size, Baron gives a condescending viewpoint on how to tune the sort_buffer_size variable in MySQL. In a much-nicer-nutshell, his advice is “do not change sort_buffer_size from the default.”

Baron did not explain the logic behind his reasoning, he handwaves that “people utterly ruin their server performance and stability with it,” but does not explain how changing the sort_buffer_size kills performance and stability. Regardless of how respected and knowledgeable the source, NEVER take any advice …

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