From: martial.bizel@free.fr
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: out of memory
Date: Tue, 14 Feb 2006 17:03:38 +0100
Message-ID: <1139933018.43f1ff5a5e542@imp6-g19.free.fr> (raw)
In-Reply-To: <15115.1139931169@sss.pgh.pa.us>
References: <1139930651.43f1f61b04773@imp2-g19.free.fr>
<15115.1139931169@sss.pgh.pa.us>
Thanks for your response,
I've made this request :
SELECT query_string, DAY.ocu from search_data.query_string,
(SELECT SUM(occurence) as ocu, query
FROM daily.queries_detail_statistics
WHERE date >= '2006-01-01' AND date <= '2006-01-30'
AND portal IN (1,2)
GROUP BY query
ORDER BY ocu DESC
LIMIT 1000) as DAY
WHERE DAY.query=id;
and after few minutes, i've error "out of memory" with this execution plan :
Nested Loop (cost=8415928.63..8418967.13 rows=1001 width=34)
-> Subquery Scan "day" (cost=8415928.63..8415941.13 rows=1000 width=16)
-> Limit (cost=8415928.63..8415931.13 rows=1000 width=12)
-> Sort (cost=8415928.63..8415932.58 rows=1582 width=12)
Sort Key: sum(occurence)
-> HashAggregate (cost=8415840.61..8415844.56 rows=1582
width=12)
-> Seq Scan on queries_detail_statistics
(cost=0.00..8414056.00 rows=356922 width=12)
Filter: ((date >= '2006-01-01'::date) AND (date
<= '2006-01-30'::date) AND (((portal)::text = '1'::text) OR ((portal)::text =
'2'::text)))
-> Index Scan using query_string_pkey on query_string (cost=0.00..3.01
rows=1 width=34)
Index Cond: ("outer".query = query_string.id)
(10 rows)
if HashAgg operation ran out of memory, what can i do ?
thanks a lot
martial
> martial.bizel@free.fr writes:
> > I've error "out of memory" with these traces :
>
> Doing what?
>
> > AggContext: -1976573952 total in 287 blocks; 25024 free (414 chunks);
> > -1976598976 used
> > DynaHashTable: 503439384 total in 70 blocks; 6804760 free (257 chunks);
> > 496634624 used
>
> I'd guess that a HashAgg operation ran out of memory ...
>
> regards, tom lane
>
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To: pgsql-performance@postgresql.org
Cc: martial.bizel@free.fr, tgl@sss.pgh.pa.us
Subject: Re: out of memory
In-Reply-To: <1139933018.43f1ff5a5e542@imp6-g19.free.fr>
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