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RE: decreased caching efficiency?
From: "Roeland M.J. Meyer" <rmeyer () MHSC com>
Date: Sat, 21 Oct 2000 23:19:14 -0700


Christian,

I invite you to www.photoloft.com
Each album is dynamic and the site uses FlashPix technology.
Have fun with it.

-----Original Message-----
From: Christian Kuhtz [mailto:ck () arch bellsouth net]
Sent: Friday, October 20, 2000 12:14 PM
To: nanog () merit edu
Subject: Re: decreased caching efficiency?

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."




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