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Webapp vs. site collection vs. site vs. app pool vs. ???

Asked By: Callie Figueroa Date: Feb 03, 2007 Category: MOSS Views: 294

We finally have a test install of MOSS07 up and running for us to play
with. Reading through some of the stuff, I tend to keep getting hung up
on some of the basic terminology. I'm struggling to have a clear
definition for some of these. Below are the terms and my interpretation.
Please let me know if I'm in the ballpark or not. ;o)

Web Application = IIS Site
Site Collection = one Top Level site and all subsites that branch from
that.
Site = Any site within a site collection
Application Pool = (I'm still not entirely sure about this one).

In general, what are the rules of thumb regarding Web Applications and
Site Collection relations. Should we have more than one Web Application?
If so, why/when should we? How many application pools should we have?

Tagged:webapp vs site collection app pool

4 Answers Found

Answer #1 Answered By: Jolene Sandoval Answered On: Feb 03, 2007

Application is in IIS. If you open your IIS, you will find it under
you computer name as a sub folder. This is where you define which web
application (Virtual Server) taking resources and isolated from
others. So, one application Pool goes down will take all web
applications consuming it.

Answer #2 Answered By: Brandan Roach Answered On: Feb 03, 2007

Based on what Darrel and cobrachen suggested, would this hierarchy be
correct in MOSS perspective?

IIS > Application Pool > Web Application > Site Collection > Site

Answer #3 Answered By: Kai Carney Answered On: Feb 03, 2007

At a basic level, application pools provide memory and security seperation to
the different web applications. From a best practices perspective, you should
have a seperate application pool identity for your central administration
application, and then another identify for each application after that. This
discussion usually gets a bit more murky, though, because each application pool
can require up to 200MB of RAM on your server and requires the administration of
another account. You would need to judge that requirement against your server
hardware and general operating environment.

Answer #4 Answered By: Gaurav Nemane Answered On: Feb 03, 2007

Thanks for that explanation. That helps a lot!

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