From: Jean-Pierre Pelletier <pelletier_32@sympatico.ca>
To: pgsql-performance@postgresql.org
Subject: Fw: Queries 15 times slower on 8.1 beta 2 than on 8.0
Date: Thu, 22 Sep 2005 18:43:31 -0400
Message-ID: <BAYC1-PASMTP03094C43233FC4F448354095970@CEZ.ICE> (raw)
----- Original Message -----
From: "Jean-Pierre Pelletier" <pelletier_32@sympatico.ca>
To: <josh@agliodbs.com>
Sent: Thursday, September 22, 2005 6:37 PM
Subject: Re: [PERFORM] Queries 15 times slower on 8.1 beta 2 than on 8.0
> How do I produce an "Index scan plan" ?
>
> ----- Original Message -----
> From: "Josh Berkus" <josh@agliodbs.com>
> To: <pgsql-performance@postgresql.org>
> Cc: "Jean-Pierre Pelletier" <pelletier_32@sympatico.ca>; "John Arbash
> Meinel" <john@arbash-meinel.com>
> Sent: Thursday, September 22, 2005 6:19 PM
> Subject: Re: [PERFORM] Queries 15 times slower on 8.1 beta 2 than on 8.0
>
>
>> Jean-Pierre,
>>
>> First off, you're on Windows?
>>
>>> " -> Seq Scan on price p (cost=0.00..11317.75 rows=581475 width=4)
>>> (actual time=0.004..1143.720 rows=581475 loops=1)"
>>
>> Well, this is your pain point. Can we see the index scan plan on 8.1?
>> Given that it's *expecting* only one row, I can't understand why it's
>> using a seq scan ...
>>
>>> "Nested Loop Left Join (cost=0.00..11.02 rows=1 width=0) (actual
>>> time=0.000..0.000 rows=1 loops=1)"
>>> " -> Nested Loop Left Join (cost=0.00..5.48 rows=1 width=4) (actual
>>> time=0.000..0.000 rows=1 loops=1)"
>>> "Total runtime: 0.000 ms"
>>
>> Feh, this looks like the "windows does not report times" bug, which makes
>> it hard to compare ...
>>
>> --
>> --Josh
>>
>> Josh Berkus
>> Aglio Database Solutions
>> San Francisco
>
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Cc: pelletier_32@sympatico.ca
Subject: Re: Fw: Queries 15 times slower on 8.1 beta 2 than on 8.0
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