SELECT MAX(price) AS price FROM pricehistory WHERE UNIX_TIMESTAMP(CONVERT_TZ(timestamp, '+00:00', 'SYSTEM')) > UNIX_TIMESTAMP(CONVERT_TZ(DATE_SUB(NOW(), INTERVAL 1000 DAY), '+00:00', 'SYSTEM')) AND region='us';
Ok so this query runs really slow. I think it takes about 500ms to run for only 300k-400k rows.
Roughly 1/5 of all the rows have a region=’us’. If I remove the UNIX_TIMESTAMP() function it drops the run time by about 100ms so I’ll probably do that.
I’ve tried indexing, but I’m new to indexing and have never done it before. All the indexing I’ve done has either had no effect or slowed the query down even more.
I need the max price in the last
x days, of only 1/5 of the rows (region=’us’) in the whole table. I can’t think of a way to build an index out of that.
Note: I also have a query that gets the minimum price.
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