"That table would entirely fit in InnoDB Buffer Pool "
I would like to see how it fits in the pool on 2GB linode (mentioned in the article), also, I like that people try to think before saying "big data" and grabbing some NoSQL that is not very good fit in some places or gigantic mapreduce in 67 servers.
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I am saying there is NO WAY MySQL sucks at 7M records. That's just jacked design. Talk to me at 7B when you need to reach for something bigger.