still repetetive
I have tried adding that index. It is a nice trick, putting the data I want into the index for quick access. Strangely, it doesn't make much difference; it takes the query time from 9 sec to 8, and doing it again is still 8. If I use an equivalent query with a straight join it takes 0.2 sec, and doing again takes 0.02 sec.
Looking at strace, I still see the mysql process reading the same chunk of file over and over. It still looks like it is the data file that it is reading, even though it should be using only the index. That behaviour is the mystery I'm hoping to solve, to speed up my queries.
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still repetetive
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