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visits member for 2 years, 1 month
seen Jul 3 '12 at 22:27

comment Can MySQL reasonably perform queries on billions of rows?
You emphasize the huge difference in hard drive vs memory latency but your numbers are off by a factor of 1000. If hard drives have a latency of around 10ms, and memory 10ns, the latencies do not differ by a factor of 1,000 but a factor of 1,000,000!