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Re: Neat trick

From: Arvind Sharma <arvind321(at)yahoo(dot)com>
To: Mladen Gogala <mgogala(at)vmsinfo(dot)com>, "pgsql-novice(at)postgresql(dot)org" <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Neat trick
Date: 2010-09-15 14:33:46
Message-ID: 405568.90748.qm@web110103.mail.gq1.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-novice
Hi Mladen,

Which attribute in the postgresql.conf file this is set ?

I am running CentOS Linux, PG 8.4

Thanks!
Arvind





________________________________
From: Mladen Gogala <mgogala(at)vmsinfo(dot)com>
To: "pgsql-novice(at)postgresql(dot)org" <pgsql-novice(at)postgresql(dot)org>
Sent: Tue, September 14, 2010 2:30:28 PM
Subject: [NOVICE] Neat trick

I figured out how to speed up the sequential scans using "blockdev" command. 
Essentially, this increases the read-ahead on the underlying block device for 
the file system. It will change the read-ahead value for the entire disk, even 
if there are several partitions on the disk.  The results are very promising. 
Unfortunately, I didn't take baseline numbers and measure the effect with 
precision, but the look of it is that things are much faster with the read-ahead 
set to 2048 instead of the default 256. The read-ahead is measured in sectors 
read ahead by the OS. The OS is Red Hat Linux, EL 5.5.

-- 
Mladen Gogala Sr. Oracle DBA
1500 Broadway
New York, NY 10036
(212) 329-5251
http://www.vmsinfo.com The Leader in Integrated Media Intelligence Solutions




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  • Neat trick at 2010-09-14 21:30:28 from Mladen Gogala

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