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  • the key_buffer_size only affects MyISAM (key buffer caches index pages from MYI files). Commented May 22, 2011 at 16:58
  • It just so happens that @Mike asked the exact same question in ServerFault (serverfault.com/questions/272337/…) I suggested the same thing regarding tmp_table_size. At least, you found a doc verifying this possibility. Your other thoughts seem reasonable to me. +1 for you !!! Commented May 22, 2011 at 17:05