From: Greg Quinn <greg@officium.co.za>
To: pgsql-performance@postgresql.org
Subject: Re: Slow performance on Windows .NET and OleDb
Date: Wed, 29 Mar 2006 08:22:08 +0200
Message-ID: <006c01c652f9$1ca9c420$0200a8c0@pta.homex.co.za> (raw)
References: <000d01c65261$19a3fa40$0200a8c0@pta.homex.co.za>
<20060328173213.GO75181@pervasive.com>
<442977D7.5060508@commandprompt.com>
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?
Thanks
----- Original Message -----
From: "Joshua D. Drake" <jd@commandprompt.com>
To: "Jim C. Nasby" <jnasby@pervasive.com>
Cc: "Greg Quinn" <greg@officium.co.za>; <pgsql-performance@postgresql.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
>
>
> --
>
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To: pgsql-performance@postgresql.org
Cc: greg@officium.co.za
Subject: Re: Slow performance on Windows .NET and OleDb
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