Justin Pryzby <pryzby@xxxxxxxxxxxxx> writes: > On Mon, Dec 20, 2021 at 08:11:42PM -0800, Lars Bergeson wrote: >> Still taking 10X more I/O to read the smaller table. Very odd. > If I'm not wrong, it's even worse than that ? > It takes 20 or 30sec to run the query - but it says the associated I/O times > are ~500sec or ~6000sec ? It would help if somebody had labeled the units of I/O Time ... but I'm guessing those are microsec vs. the millisec of the other times, because otherwise it's completely wrong. regards, tom lane