Horton

Re: Slow count(*) again...

Mladen Gogala <mgogala@vmsinfo.com>

View thread
From: Mladen Gogala <mgogala@vmsinfo.com>
To: Neil Whelchel <neil.whelchel@gmail.com>
Cc: "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Date: 2010-10-11T20:58:37Z
Lists: pgsql-hackers, pgsql-performance 
Neil Whelchel wrote:
>
>
> That is why I suggested an estimate(*) that works like (a faster) count(*) 
> except that it may be off a bit. I think that is what he was talking about 
> when he wrote this.
>
>   
The main problem with "select count(*)" is that it gets seriously 
mis-used.  Using "select count(*)" to establish existence is bad for 
performance and for code readability. 

-- 
 
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