[31795] in North American Network Operators' Group
Re: decreased caching efficiency?
daemon@ATHENA.MIT.EDU (Christian Kuhtz)
Fri Oct 20 15:18:44 2000
Date: Fri, 20 Oct 2000 15:14:10 -0400
From: Christian Kuhtz <ck@arch.bellsouth.net>
To: nanog@merit.edu
Message-ID: <20001020151410.G11682@ns1.arch.bellsouth.net>
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In-Reply-To: <4FC0FE0C0F43D311B23300508B1216848F3561@vsiexch.corp.kore.com>; from Travis Grant on Fri, Oct 20, 2000 at 11:59:58AM -0700
Errors-To: owner-nanog-outgoing@merit.edu
On Fri, Oct 20, 2000 at 11:59:58AM -0700, Travis Grant wrote:
[..]
> Commerce sites are also dependent on dynamic technology that cannot be
> cached. Although you will find sites that are entirely static (buy.com &
> etoys.com) you will generally find that these models are based on volume and
> that the majority of these sites have never seen a dollar in profit. However
> the profitable boutique type sites like eStyle.com, are entirely dynamic.
> Margins are protected by a contractual product line. When you place an
> order, a query verifies inventory prior to final checkout. In addition,
> product pages indicate whether items are in stock or not. You cant cache
> these types of sites.
[..]
Each and every button, product image etc could be cached, regardless of the
dynamic nature of the website. Images cost cycles, bw.
[..]
> Most caching implementations will cost way more than the bandwidth costs
> they avoid.
You get no argument there ;-). I never felt that you could ever justify
caching in terms of bandwidth savings. You can only justify in terms of
improving a users experience. And in that sense, you are giving considerable
resources to a content origin, and a free service to them.
That's why the CDN strategy is much more attractive, where you have a hosting
relationship of some kind with the content origin.
[..]
> load on the DB servers. But TTLs will usually have to be set pretty low (2
> seconds) in order to do this and the technologies will have to be catered to
> web development environments (like cacheflow and ASP).
[..]
Hmm, if you cache what I suggest above, that's not really neccessary... No?
Cheers,
Chris
--
Christian Kuhtz Architecture, BellSouth.net
<ck@arch.bellsouth.net> -wk, <ck@gnu.org> -hm Atlanta, GA
"Speaking for myself only."
