From: | Ireneusz Pluta <ipluta(at)wp(dot)pl> |
---|---|
To: | jamcito <jamcito(at)poczta(dot)fm> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: partition text/varchar check problem |
Date: | 2006-12-16 20:16:13 |
Message-ID: | 4584540D.2080208@wp.pl |
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Thread: | |
Lists: | pgsql-performance |
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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