From: Ireneusz Pluta <ipluta@wp.pl>
To: jamcito <jamcito@poczta.fm>
Cc: pgsql-performance@postgresql.org
Subject: Re: partition text/varchar check problem
Date: Sat, 16 Dec 2006 21:16:13 +0100
Message-ID: <4584540D.2080208@wp.pl> (raw)
In-Reply-To: <458402D4.7080500@poczta.fm>
References: <458402D4.7080500@poczta.fm>
jamcito napisał(a):
> /*********************************************/
> SET constraint_exclusion=on;
> SET
>
> SHOW constraint_exclusion;
> constraint_exclusion
> ----------------------
> on
> (1 row)
>
> EXPLAIN SELECT * FROM data WHERE name = 'aaa';
> QUERY PLAN
> ------------------------------------------------------------------------
> Result (cost=0.00..24.42 rows=7 width=48)
> -> Append (cost=0.00..24.42 rows=7 width=48)
> -> Seq Scan on data (cost=0.00..22.38 rows=5 width=48)
> Filter: ((name)::text = 'aaa'::text)
> -> Seq Scan on data_a data (cost=0.00..1.02 rows=1 width=23)
> Filter: ((name)::text = 'aaa'::text)
> -> Seq Scan on data_b data (cost=0.00..1.02 rows=1 width=23)
> Filter: ((name)::text = 'aaa'::text)
> (8 rows)
>
Can you show what you get from:
EXPLAIN SELECT * FROM data WHERE name LIKE 'a%'
?
Irek.
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To: pgsql-performance@postgresql.org
Cc: ipluta@wp.pl, jamcito@poczta.fm
Subject: Re: partition text/varchar check problem
In-Reply-To: <4584540D.2080208@wp.pl>
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