Hello,
I am confused on which are the parameters for different queries. I am trying to run VACUUM on a big table, and it is easier for me to set the work memory for the specific session instead of tuning it in postgresql.conf.
I noticed that if I do:
set work_mem='1GB';
it doesn't help VACUUM, I have to do:
set maintenance_work_mem='1GB';
to accelerate the operation. I could notice that by running VACUUM VERBOSE and see that the table was scanned less times an the operation finished a lot faster.
My question is, for which operations does work_mem matter and for which ones does maintenance_work_mem do? I am specially interested in operations like ANALYZE and VACUUM, I believe ANALYZE depends on work_mem and VACUUM on maintenance_work_mem.
Can you confirm my understanding?