With this particular client, I ran a SHOW STATUS, waited 100 seconds, and ran it again. Handler_read_first jumped by about 53. So I wrote down in my notes: first in the index…every other second. Lots of table scans? As soon as I wrote it down I said, “That’s a haiku!” I counted syllables, and it works, but only if you pronounce “Every” with 3 syllables.