I normally create my indexes to match the where clause of the query. While technically, it should not matter, I find a lot of time, it does.
I would create an index on (status, sender_reference, sent_at) and see if the improves your query performance. SELECT * FROM docs WHERE status IN ('draft', 'sent') AND sender_reference IN ('Custom/1175', 'Client/362', 'Custom/280') ORDER BY sent_at DESC Thanks, Chris Hoover Senior DBA AWeber.com Cell: (803) 528-2269 Email: chr...@aweber.com > On Jun 12, 2023, at 4:17 PM, benoit <ben...@hopsandfork.com> wrote: > > Hello > > I have a database with few 60gb tables. Tables rows are requested with > multiple ANY or IN operators. I am not able to find an easy way to make DB > able to use indexes. I often hit the index, but see a a spike of 200mb of IO > or disk read. > > I am using version 13 but soon 14. > > I wrote a reproduction script on version 14 with plans included. > https://gist.github.com/benoittgt/ab72dc4cfedea2a0c6a5ee809d16e04d > > I also have plans on a snapshot of the DB with real data. > - The current query that I try to improve : > https://explain.dalibo.com/plan/8b8f6e0he9feb551 > - I added the DB schema + index in query view. As you can see I have many > indexes for testing purpose and try what the planner can do. > - The optimized query when I have only one ANY and migrate to UNION ALL for > each parameter of the ANY operator > https://explain.dalibo.com/plan/427gg053d07328ga . Query is fast as I would > like but it means generate some merge to be able to get a fast result. > - The new issue I have when I have a new ANY operator on the previous > optimized query. Big IO/read https://explain.dalibo.com/plan/e7ha9g637b4eh946 > > It seems to me quite undoable to generate for every parameters a query that > will then merge. I have sometimes 3-4 ANY operators with up to 15 elements in > an array. > > Is there a misusage of my indexes? > Is there a limitation when using ANY or IN operators and ordered LIMIT behind? > > Thanks a lot