On Sun, Mar 20, 2011 at 11:20 PM, Adam Tistler wrote:
> logicops2=# explain analyze select count(*) from nodes where node_id = any(
> Array(select node_id from nodes limit 10) );
> QUERY PLAN
>
> -Original Message-
> From: pgsql-performance-ow...@postgresql.org [mailto:pgsql-performance-
> ow...@postgresql.org] On Behalf Of Adam Tistler
> Sent: Monday, March 21, 2011 12:17 AM
> To: Pavel Stehule
> Cc: pgsql-performance@postgresql.org
> Subject: Re: [PERFORM
2011/3/21 Adam Tistler :
> Pavel, thanks for the help.
>
> I increased work_mem from 16MB to 64MB, no difference. The queries are
> really just a test case. My actual queries are actual just large number of
> primary keys that I am selecting from the db:
>
> For example:
> select * from nodes
Pavel, thanks for the help.
I increased work_mem from 16MB to 64MB, no difference. The queries are really
just a test case. My actual queries are actual just large number of primary
keys that I am selecting from the db:
For example:
select * from nodes where node_id in ( 1, 2, 3 . )
I
Hello
I think so HashAggregate goes out of memory - you can try to increase
a work_mem.
There are better queries for counting duplicit then cross join
Regards
Pavel Stehule
2011/3/21 Adam Tistler :
> logicops2=# explain analyze select count(*) from nodes where node_id = any(
> Array(select n
logicops2=# explain analyze select count(*) from nodes where node_id = any(
Array(select node_id from nodes limit 10) );
QUERY PLAN
-
Hello
2011/3/20 Adam Tistler :
> I have noticed that SELECT ... = ANY(ARRAY(...)) is about twice as fast as
> SELECT IN ( ... ).
> Can anyone explain a reason for this? Results are the bottom and are
> reproducible. I can test with other versions if that is necessary.
>
send a result of EXPL
I have noticed that SELECT ... = ANY(ARRAY(...)) is about twice as fast as
SELECT IN ( ... ).
Can anyone explain a reason for this? Results are the bottom and are
reproducible. I can test with other versions if that is necessary.
./configure --prefix=/usr/local/pgsql84 --with-openssl --with-p
