From: mark durrant <markd89@yahoo.com>
To: pgsql-performance@postgresql.org
Subject: Select performance vs. mssql
Date: Mon, 23 May 2005 22:47:15 -0700 (PDT)
Message-ID: <20050524054715.3988.qmail@web53106.mail.yahoo.com> (raw)
Hi,
I have some experience with MSSQL and am examining
PostgreSQL. I'm running under Windows. I like what I
see so far, but I'm hoping for some performance
advice:
1. My test database has 7 million records.
2. There are two columns - an integer and a char
column called Day which has a random value of Mon or
Tues, etc. in it.
3. I made an index on Day.
My query is:
select count(*) from mtable where day='Mon'
Results:
1. P3 600 512MB RAM MSSQL. It takes about 4-5 secs to
run. If I run a few queries and everything is cached,
it is sometimes just 1 second.
2. Athlon 1.3 Ghz 1GB RAM. PostgreSQL takes 7 seconds.
I have played with the buffers setting and currently
have it at 7500. At 20000 it took over 20 seconds to
run.
5 seconds vs 7 isn't that big of a deal, but 1 second
vs 7 seconds is. Also, the slower performance is with
much lesser hardware.
Any ideas to try?
Thanks much,
Mark
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: markd89@yahoo.com
Subject: Re: Select performance vs. mssql
In-Reply-To: <20050524054715.3988.qmail@web53106.mail.yahoo.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox