From: Merlin Moncure <mmoncure@gmail.com>
To: Jim C. Nasby <jnasby@pervasive.com>
Cc: PFC <lists@peufeu.com>
Cc: Scott Marlowe <smarlowe@g2switchworks.com>
Cc: Marcos <mjs_ops@gmx.net>
Cc: pgsql-performance@postgresql.org
Subject: Re: Decide between Postgresql and Mysql (help of
Date: Wed, 29 Mar 2006 08:48:22 -0500
Message-ID: <b42b73150603290548s6894ac6bnecb5c32eb08bae0@mail.gmail.com> (raw)
In-Reply-To: <20060328215608.GA75181@pervasive.com>
References: <1143559902.1241.16.camel@servidor>
<1143572392.3625.79.camel@state.g2switchworks.com>
<op.s642dpyecigqcu@apollo13>
<20060328215608.GA75181@pervasive.com>
On 3/28/06, Jim C. Nasby <jnasby@pervasive.com> wrote:
> Heh, too quick on the send button...
>
> On Tue, Mar 28, 2006 at 09:42:51PM +0200, PFC wrote:
> Actually, it's entirely possible to do stuff like web counters, you just
> want to do it differently in PostgreSQL. Simply insert into a table
> every time you have a hit, and then roll that data up periodically.
>
> And using MyISAM is no panacea, either. Trying to keep a web counter in
> a MyISAM table means you'll serialize every web page on that counter
> update.
if you want raw speed, use a sequence for a hit-counter. sequences
are wonder-tools and very lightweight. Explain analyze for a sequence
nextval on my desktop box reports 47 microseconds. thats 200k
sequence updates/second. insert into a table (fsync off/cache write,
no keys) is not much slower.
PostgreSQL 8.1 saw a lot of performance improvements...but the most
important (and least publicized) is the reduced latency of simple
queries in high cache enviroments.
merlin
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: mmoncure@gmail.com, jnasby@pervasive.com, lists@peufeu.com, smarlowe@g2switchworks.com, mjs_ops@gmx.net
Subject: Re: Decide between Postgresql and Mysql (help of
In-Reply-To: <b42b73150603290548s6894ac6bnecb5c32eb08bae0@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