| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Geoffrey <lists(at)serioustechnology(dot)com> |
| Cc: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Alan Hodgson <ahodgson(at)simkin(dot)ca>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: In the belly of the beast (MySQLCon) |
| Date: | 2008-04-18 19:18:07 |
| Message-ID: | 20080418191807.GE572@alvh.no-ip.org |
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| Lists: | pgsql-advocacy pgsql-general |
Geoffrey wrote:
> I'm really not altogether sure what you mean by transaction velocity.
> I'm pretty sure the electrons are traveling pretty close to the speed of
> light. ;)
Actually, electrons themselves flow rather slowly -- millimeters per
second according to Wikipedia. The signal propagation is a bit faster:
"typically 75% of light speed", Wikipedia again.
Anyway, he means "transaction rate". But the actual useful figure is
further removed from that because we're mostly only interested in write
transactions, not read-only (though those still have an effect in
versions earlier than 8.3.)
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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