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Re: Slow performance on Windows .NET and OleDb

From: "Greg Quinn" <greg(at)officium(dot)co(dot)za>
To: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Slow performance on Windows .NET and OleDb
Date: 2006-03-29 06:22:08
Message-ID: 006c01c652f9$1ca9c420$ (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
The query is,

select * from users

which returns 4 varchar fields, there is no where clause

Yes, I am running the default postgres config. Basically I have been a MySQL 
user and thought I would like to check out PostGreSql. So I did a quick 
performance test. The performance was so different that I thought PostGreSQL 
was nothing compared to MySQL, but now it seems its just a few configuration 
options. Strange how the defult config would be so slow...

I have begun reading the documentation but am not too sure what options I 
can quickly tweak to get good performance, could somebody give me some tips?


----- Original Message ----- 
From: "Joshua D. Drake" <jd(at)commandprompt(dot)com>
To: "Jim C. Nasby" <jnasby(at)pervasive(dot)com>
Cc: "Greg Quinn" <greg(at)officium(dot)co(dot)za>; <pgsql-performance(at)postgresql(dot)org>
Sent: Tuesday, March 28, 2006 7:52 PM
Subject: Re: [PERFORM] Slow performance on Windows .NET and OleDb

> Jim C. Nasby wrote:
>> On Tue, Mar 28, 2006 at 02:14:00PM +0200, Greg Quinn wrote:
>>> Hello,
>>> I have just installed PostGreSql 8.1 on my Windows XP PC. I created a 
>>> simple table called users with 4 varchar fields.
>>> I am using the OleDb connection driver. In my .NET application, I 
>>> populate 3000 records into the table to test PostGreSql's speed. It 
>>> takes about 3-4 seconds.
>>> Even worse is displaying the 3000 records in a ListView control. It 
>>> takes about 7 seconds. In MySQL, the exact same table and application 
>>> displays the same 3000 records in under 1/2 second!!!
>> Have you vacuumed recently? This smells like it might be a table bloat
>> problem.
> This could be a lot of things...
> He is probably running the default postgresql.conf which is going to 
> perform horribly.
> What is your work_mem? shared_buffers?
> Are you passing a where clause? If so is there an index on the field that 
> is subject to the clause?
> When you do the population, is it via inserts or copy?
> Joshua D. Drake
> -- 
>             === The PostgreSQL Company: Command Prompt, Inc. ===
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Next:From: Greg QuinnDate: 2006-03-29 06:24:58
Subject: Re: Slow performance on Windows .NET and OleDb
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Subject: Re: simple join uses indexes, very slow

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