On Fri, 17 Dec 2004 23:09:07 +0100
"Steinar H. Gunderson" <[EMAIL PROTECTED]> wrote:

> On Fri, Dec 17, 2004 at 10:56:27PM +0100, Steinar H. Gunderson wrote:
> > I'm a bit unsure -- should counting ~3 million rows (no OIDs, PG
> > 7.4, everything in cache, 32-byte rows) take ~3500ms on an Athlon 64
> > 2800+?
> (I realize I was a bit unclear here. This is a completely separate
> case, not related to the original poster -- I was just wondering if
> what I'm seeing is normal or not.)

  It depends more on your disk IO than the processor.  Counting isn't
  processor intensive, but reading through the entire table on disk 
  is.  I've also seen a huge difference between select count(*) and 
  select count(1) in older versions, haven't tried it on a recent
  version however. 

   Frank Wiles <[EMAIL PROTECTED]>

---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

Reply via email to