You're right, it does... but it's quite odd, because I re-ran the
explain-analyze statement and got the same results.
Still, the query now runs for about a second as mentioned before, so it's
almost like something's missing from the explain, but I'm certain I copied it
all.
I did this via pgadmin, but that shouldn't matter, should it?
Thank you,
Peter Slapansky
______________________________________________________________
Od: Igor Neyman <iney...@perceptron.com>
Komu: "sl...@centrum.sk" <sl...@centrum.sk>, Pavel Stehule
<pavel.steh...@gmail.com>
Dátum: 07.08.2013 15:47
Predmet: RE: [PERFORM] Re: [PERFORM] Sub-optimal plan for a paginated query on
a view with another view inside of it.
CC: "pgsql-performance@postgresql.org"
Your last explain analyze (with 3 settings set to 32) shows query duration
10ms, not 1sec.
Am I wrong?
Regards,
Igor Neyman
______________________________________________________________
From: pgsql-performance-ow...@postgresql.org
[mailto:pgsql-performance-ow...@postgresql.org] On Behalf Of sl...@centrum.sk
Sent: Wednesday, August 07, 2013 8:43 AM
To: Pavel Stehule
Cc: pgsql-performance@postgresql.org
Subject: [PERFORM] Re: [PERFORM] Sub-optimal plan for a paginated query on a
view with another view inside of it.
Good day,
I have included a link to the result of EXPLAIN ANALYZE. It's this one:
https://app.box.com/s/u8nk6qvkjs4ae7l7dh4h
<https://app.box.com/s/u8nk6qvkjs4ae7l7dh4h>
Here's a link to Depesz's explain (if links to the site are okay):
http://explain.depesz.com/s/gCk <http://explain.depesz.com/s/gCk>
I have just tried setting geqo_threshold, join_collapse_limit and
from_collapse_limit to 16, but it yielded no improvement.
Changing those three parameters to 32 did speed up the query from about 3.3
seconds to about a second (give or take 50 ms), which is a pretty good
improvement, but not quite there, as I'm looking to bring it down to about 300
ms if possible. Changing those three settings to 48 yielded no improvements
over 32.
Is there possibly something something else to tweak there?
Here's EXPLAIN ANALYZE output when the three settings have been set to 32:
http://explain.depesz.com/s/cj2 <http://explain.depesz.com/s/cj2>
Thank you.
Peter Slapansky
