Re: speed of querry?

From: "Joel Fradkin" <jfradkin(at)wazagua(dot)com>
To: "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "'Dawid Kuroczko'" <qnex42(at)gmail(dot)com>
Cc: "'PERFORM'" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: speed of querry?
Date: 2005-04-14 16:38:58
Message-ID: 000901c54110$79032aa0$797ba8c0@jfradkin
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-performance

I did as described to alter table and did not see any difference in speed.
I am trying to undo the symbolic link to the data array and set it up on
raid 5 disks in the machine just to test if there is an issue with the
config of the raid 10 array or a problem with the controller.

I am kinda lame at Linux so not sure I have got it yet still testing.
Still kind puzzled why it chose tow different option, but one is running
windows version of postgres, so maybe that has something to do with it.

The data bases and configs (as far as page cost) are the same.

Joel Fradkin

Wazagua, Inc.
2520 Trailmate Dr
Sarasota, Florida 34243
Tel. 941-753-7111 ext 305

jfradkin(at)wazagua(dot)com
www.wazagua.com
Powered by Wazagua
Providing you with the latest Web-based technology & advanced tools.
C 2004. WAZAGUA, Inc. All rights reserved. WAZAGUA, Inc
This email message is for the use of the intended recipient(s) and may
contain confidential and privileged information. Any unauthorized review,
use, disclosure or distribution is prohibited. If you are not the intended
recipient, please contact the sender by reply email and delete and destroy
all copies of the original message, including attachments.

-----Original Message-----
From: Tom Lane [mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us]
Sent: Thursday, April 14, 2005 11:21 AM
To: Dawid Kuroczko
Cc: Joel Fradkin; PERFORM
Subject: Re: [PERFORM] speed of querry?

Dawid Kuroczko <qnex42(at)gmail(dot)com> writes:
> Basically it tells postgres how many values should it keep for
> statistics per column. The config default_statistics_target
> is the default (= used when creating table) and ALTER... is
> a way to change it later.

Not quite. default_statistics_target is the value used by ANALYZE for
any column that hasn't had an explicit ALTER SET STATISTICS done on it.
So you can change default_statistics_target and that will affect
existing tables.

(It used to work the way you are saying, but that was a few releases
back...)

regards, tom lane

In response to

Responses

Browse pgsql-performance by date

  From Date Subject
Next Message Joshua D. Drake 2005-04-14 16:44:18 Re: Intel SRCS16 SATA raid?
Previous Message Tom Lane 2005-04-14 16:34:30 Re: recovery after long delete