From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Constantin Teodorescu <teo(at)flex(dot)ro> |
Cc: | Hannu Krosing <hannu(at)trust(dot)ee>, "pgsql-hackers(at)postgreSQL(dot)org" <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [HACKERS] Interesting behaviour ! |
Date: | 1999-07-14 15:14:47 |
Message-ID: | 199907141514.LAA23027@candle.pha.pa.us |
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Lists: | pgsql-hackers |
> Hannu Krosing wrote:
> >
> > You may try :
> >
> > explain select * from note where perioada=15::int2;
> >
> > i think that the default for 'untyped' numbers is int4 and
> > this currently confuses the optimiser.
>
> You are right! Thanks a lot! Watch this!
>
> contabil=> explain select * from note where perioada=29::int2;
> NOTICE: QUERY PLAN:
> Index Scan using note_perioada on note (cost=108.96 rows=1600 width=87)
>
> EXPLAIN
> contabil=> explain select * from note where perioada=29;
> NOTICE: QUERY PLAN:
> Seq Scan on note (cost=1099.99 rows=1600 width=87)
>
> My queries are faster now!
>
> I think that this thing should be fixed. You need more than common SQL
> in order to optimize your queries.
> That conversions should be automatically assumed by the query optimizer
> in order to deliver real performances.
> I don't know how difficult that would be.
I thought we had this fixed in 6.5. Is that what you are using?
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
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