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EXPLAIN FORMAT=JSON: cost_info knows why optimizer prefers one index to another

MySQL Performance Blog - Mon, 22/02/2016 - 4:41pm
EXPLAIN FORMAT=JSONTime for another entry in the EXPLAIN FORMAT=JSON is cool! series of blog posts. This time we’ll discuss how using EXPLAIN FORMAT=JSON allows you to see that [crayon-56cb5ab40ea2e161297961-i/]¬†¬†knows why the optimizer prefers one index to ...