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Re: Queries 15 times slower on 8.1 beta 2 than on 8.0

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Cc: "Jean-Pierre Pelletier" <pelletier_32(at)sympatico(dot)ca>,"John Arbash Meinel" <john(at)arbash-meinel(dot)com>
Subject: Re: Queries 15 times slower on 8.1 beta 2 than on 8.0
Date: 2005-09-22 22:19:05
Message-ID: 200509221519.05555.josh@agliodbs.com (view raw or flat)
Thread:
Lists: 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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