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Hi, I am running pg 14.4 I have a simple query : select max(c) from tab1 where name = 'xxx’ ; This query runs some times very slow. It takes about 40 minutes. Most of the time it completes in few seconds. When it runs slow, wait_event in pg_stat_activity shows “DataFileRead”. Obviously, it is reading from file storage and that is why it is taking so long. This is a big table 512GB. It has some child tables. Is there a way I can reproduce the slowness at will, so I can attempt to tune it? Or any ideas I can try to fix the issue? I hate to try something not knowing if the problem is fixed or not. That is the reason
I would like to reproduce the issue first. Thank you all! |
