I have a big query that takes about 7 seconds to run(time sending the data to the client is not counted).
Postgres uses 100% of 1 CPU when solving this query. I tried to run the query on a HDD and on a SSD with no difference. HDD show about 10% usage while the query runs.
The query has a big "select" list and no "group by" clause. If I delete all selects except one the query runs in under a second(it doesn't matter what field remains selected).
It seems that the query is slow because of the long select, can I do something to make the query faster?
Thank you.