From: PFC <lists@peufeu.com>
To: Jonathan Blitz <jb@anykey.co.il>
To: 'Francisco Reyes' <lists@stringsutils.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Adding and filling new column on big table
Date: Tue, 30 May 2006 22:24:32 +0200
Message-ID: <op.tadsa6vmcigqcu@apollo13> (raw)
In-Reply-To: <012501c6842c$bb8438f0$ddf71005@jonathanlaptop>
References: <012501c6842c$bb8438f0$ddf71005@jonathanlaptop>
>> Most laptop drives are only 5,400 RPM which would make a transaction
>> like
>> you are describing likely take a while.
>
> Not sure what my one is but it is new(ish).
If you're doing data intensive operations (like a big update which looks
like what you're doing) it will write many megabytes to the harddrive...
my laptop HDD (5400 rpm) does about 15 MB/s throughput while a standard
desktop 7200rpm drive does 55-60 MB/s throughput. Plus, seek times on a
laptop drive are horrendous.
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: lists@peufeu.com, jb@anykey.co.il, lists@stringsutils.com
Subject: Re: Adding and filling new column on big table
In-Reply-To: <op.tadsa6vmcigqcu@apollo13>
* 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