count(*) performance

From: Gábriel Ákos <akos(dot)gabriel(at)i-logic(dot)hu>
To: pgsql-performance(at)postgresql(dot)org
Subject: count(*) performance
Date: 2006-03-27 13:34:32
Message-ID: 4427E9E8.9030806@i-logic.hu
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-performance

Hi,

I guess this is an age-old 100times answered question, but I didn't find
the answer to it yet (neither in the FAQ nor in the mailing list archives).

Question: I have a table with 2.5M rows. count(*) on this table is
running 4 minutes long. (dual opteron, 4gig ram, db on 4 disk raid10
array (sata, not scsi)) Is this normal? How could I make it run faster?
Maybe make it run faster for the 2nd time? Which parameters should I
change in postgresql.conf and how?

--
Üdvözlettel,
Gábriel Ákos
-=E-Mail :akos(dot)gabriel(at)i-logic(dot)hu|Web: http://www.i-logic.hu=-
-=Tel/fax:+3612367353 |Mobil:+36209278894 =-

Responses

Browse pgsql-performance by date

  From Date Subject
Next Message Jim C. Nasby 2006-03-27 13:41:04 Re: count(*) performance
Previous Message Jim C. Nasby 2006-03-27 12:14:07 Re: experiences needed - how does Itanium2/1.5GHz(4MB) compare to AMD and Intel CPUs as far as Postgresql is concerned