On Fri, 2024-02-02 at 02:27 +0530, veem v wrote: > We have the below query which is running for ~45 seconds on postgres aurora reader instance. > I have captured the explain analyze. Want to understand, where exactly the resources are > getting spent and if we can be able to optimize it further. Aurora <> PostgreSQL, but here is what I can see: - The index scan on SCHEMA1."TAB2" has to check 2 million extra rows because "work_mem" is too small. Almost the complete time is spent there. - You may be getting a bad plan, because the statistics on SCHEMA1.TAB4 are either out of date or not detailed enough, which makes PostgreSQL underestimate the result size. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
