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Re: decreased caching efficiency?
From: Christian Kuhtz <ck () arch bellsouth net>
Date: Fri, 20 Oct 2000 15:14:10 -0400

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?


Christian Kuhtz                                     Architecture, BellSouth.net
<ck () arch bellsouth net> -wk, <ck () gnu org> -hm                       Atlanta, GA
                                                    "Speaking for myself only."

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