| From: | Torsten Förtsch <torsten(dot)foertsch(at)gmx(dot)net> |
|---|---|
| To: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | How to make PG use work_mem? |
| Date: | 2014-03-11 12:15:50 |
| Message-ID: | 531EFE76.5080501@gmx.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Hi,
I have a query that involves an external sort:
-> Sort (cost=13662680.01..13850498.48 rows=75127389 width=16)
(actual time=980098.397..1021411.862 rows=74181544 loops=1)
Sort Key: (ROW(account_id, (purchase_time)::date))
Sort Method: external merge Disk: 3118088kB
Buffers: shared hit=1568637 read=1327223,
temp read=389763 written=389763
What puzzles me is that this happens even when I set work_mem to 50GB in
the session.
Why does it still use the external merge?
The query runs on a streaming replica if that matters.
Torsten
| From | Date | Subject | |
|---|---|---|---|
| Next Message | matshyeq | 2014-03-11 12:39:12 | Re: libpq - lack of support to set the fetch size |
| Previous Message | Albe Laurenz | 2014-03-11 08:08:53 | Re: Extracting data from the view to retrieve the foreign key is not declared |