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Re: Why MySQL does not use an index?
Posted by: Rick James
Date: February 11, 2012 10:48PM

Note that your newer version picked "index merge". This is a feature that has long been rarely invoked. Perhaps the newer version has some fixes in that area.

Still index merge is not as efficient as a good compound index. Please add one of these:
INDEX(type, device_ip, created_at)
INDEX(device_ip, type, created_at)

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