Re: Queries 15 times slower on 8.1 beta 2 than on 8.0 - Mailing list pgsql-performance

From Josh Berkus
Subject Re: Queries 15 times slower on 8.1 beta 2 than on 8.0
Date
Msg-id 200509221519.05555.josh@agliodbs.com
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In response to Re: Queries 15 times slower on 8.1 beta 2 than on 8.0  ("Jean-Pierre Pelletier" <pelletier_32@sympatico.ca>)
Responses Re: Queries 15 times slower on 8.1 beta 2 than on 8.0
List pgsql-performance
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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