Alessandro Gagliardi <alessandro@xxxxxxxx> writes: > Still slow as mud: http://explain.depesz.com/s/Zfn > Now I've got indices on created, timezone, created at time zone timezone, > and (created at time zone timezone)::date. Clearly the problem isn't a lack > of indices!...except, wait, it's not actually using blocks_created_date_idx > (or blocks_created_at_timezone_idx). How do I make that happen? Did you ANALYZE the table after creating those indexes? Generally you need an ANALYZE so that the planner will have some stats about an expression index. It might still think that the other index is a better option. In that case you can experiment to see if it's right or not; the general idea is begin; drop index index_that_planner_prefers; explain analyze your_query; rollback; -- revert the index drop If that EXPLAIN isn't actually any better than what you had, then the planner was right. If it is better, let's see 'em both. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
