Re: Index only select count(*)

Hi,

yes, I'm cheating by using GUI :) (PgAdmin)

Here:

"Aggregate (cost=18240.50..18240.51 rows=1 width=0) (actual time=2911.117..2911.119 rows=1 loops=1)"
" -> Seq Scan on min1_009 (cost=0.00..18108.60 rows=52760 width=0) (actual time=5.390..2816.274 rows=52760 loops=1)"
"Total runtime: 2912.211 ms"

-----Original Message-----
From: Alban Hertroys [mailto:haramrae(at)gmail(dot)com]
Sent: 7. lokakuuta 2013 12:31
To: Toni Helenius
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] Index only select count(*)

On Oct 7, 2013, at 11:23, Toni Helenius <Toni(dot)Helenius(at)syncrontech(dot)com> wrote:

> The output of analyze:
> "Aggregate (cost=18240.50..18240.51 rows=1 width=0)"
> " -> Seq Scan on min1_009 (cost=0.00..18108.60 rows=52760 width=0)"

That's the output of Explain, not of Explain Analyze. The latter has actual measurements to go with the estimated costs, which gives a lot more insight.

Alban Hertroys
--
If you can't see the forest for the trees, cut the trees and you'll find there is no forest.