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3-tier architecture -- poor Manageability?

Seid Myadiyev
Ranch Hand

Joined: Jul 02, 2002
Posts: 196
Friends,
Do you agree that the drawback of the 3-tier architecture is Manageability?
Can you please share your knowledge of 1, 2 and 3 – tier architectures and their QoS?
Thank you!
Seid


Seid Myadiyev<br />SCJP, SCWCD, SCBCD, SCEA-Part 1
Chris Mathews
Ranch Hand

Joined: Jul 18, 2001
Posts: 2712
3-tier architecture is standard and has a higher level of manageability than say a 4-tier. Before I go off on a tangent I want to make sure we are on the same page.
1-tier Architecture
Tier 1 - Everything
2-tier Architecture
Tier 1 - Client
Tier 2 - Database
3-tier Architecture
Tier 1 - Client (Browser or Application)
Tier 2 - Web and Application (Full J2EE Server)
Tier 3 - Database
4-tier Architecture
Tier 1 - Client (Browser or Application)
Tier 2 - Web (Servlet/JSP Container)
Tier 3 - Application (EJB Container)
Tier 4 - Database
Do these match your definitions for the different tiers?
Seid Myadiyev
Ranch Hand

Joined: Jul 02, 2002
Posts: 196
Chris,
Thank you very much for this, but what are the benefits and drawbacks of each architecture in terms of their Quality of Service (QoS) requirements?
Thanks very much!
Seid
Thomas Paul
mister krabs
Ranch Hand

Joined: May 05, 2000
Posts: 13974
One huge difference is scalability. Each time you add a tier you are making your application more scaleable because its easier to apply more horsepower to just the tier that needs it.


Associate Instructor - Hofstra University
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Rufus BugleWeed
Ranch Hand

Joined: Feb 22, 2002
Posts: 1551
I researched this. On the yahoo site or the JR somebody talked about Sun's codecamp. On Sun's site I found a codecamp document. An early chapter was helpful in understanding some of these issues.
I still only scored 66% on common architectures and concepts.
This is a hard area to find data on.
 
It is sorta covered in the JavaRanch Style Guide.
 
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