From: sathiya psql <sathiya.psql@gmail.com>
To: pgsql-performance@postgresql.org
Subject: postgresql is slow with larger table even it is in RAM
Date: Tue, 25 Mar 2008 14:05:20 +0530
Message-ID: <f966c2ee0803250135h57ba1d5bs41f77616ae7186dc@mail.gmail.com> (raw)
Dear Friends,
I have a table with 32 lakh record in it. Table size is nearly 700 MB,
and my machine had a 1 GB + 256 MB RAM, i had created the table space in
RAM, and then created this table in this RAM.
So now everything is in RAM, if i do a count(*) on this table it returns
327600 in 3 seconds, why it is taking 3 seconds ????? because am sure that
no Disk I/O is happening. ( using vmstat i had confirmed, no disk I/O is
happening, swap is also not used )
Any Idea on this ???
I searched a lot in newsgroups ... can't find relevant things.... ( because
everywhere they are speaking about disk access speed, here i don't want to
worry about disk access )
If required i will give more information on this.
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: sathiya.psql@gmail.com
Subject: Re: postgresql is slow with larger table even it is in RAM
In-Reply-To: <f966c2ee0803250135h57ba1d5bs41f77616ae7186dc@mail.gmail.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