Doubt about R/2 architecture.......

[Former Member]

Maybe a basic one but i didnt find the answer for it.....

<b>Question:</b>

Which of the following layers are absent in the 'R/2' architecture ?

a) Presentation Layer

b) Application Layer

c) Database Layer

d) Connector Layer

Though there is no such thing as Connector Layer in any of the architecture, one of the 3 layers of R/3 architecture(Presentation, Database and Application Layers) can also be missing in R/2 which i feel depends on the way the application is written.......

[Former Member]

Hi Prakash

in SAP R/2 , the Appliction and Database are combine to one Layer .

R/2

a) Presentation Layer

b) Application + Database Layer

R/3

a) Presentation Layer

b) Application Layer

c) Database Layer

Regards

Wiboon

[Former Member]

Hi wiboon,

I used the same logic but then as i said its the programmer's logic if he has to hide the presentation layer as Jinesh says or if the database layer is hidden as u say....

when we are integrating application layer with database layer as u say, which layer is considered to be hidden ?

What is the name of the resulting layer when u integrate application layer with database layer?

Anyways,Thanks for the fast reply guys..

[former_member197281]

Hi,

presentation layer...........

reward points if helpful,

Jinesh.

[former_member223537]

Hi Prakash,

The Application Layer is hidden in R/2 architecture as it sits along with Database layer. Hence its called as 2 tier system

Presentation=>Application+Database

R/3 is 3 tier system bcz it has three layers

Presentation=>Application=>Database

The limitation of 2 tier is its speed of response. Since Application layer sits along with Database layer, everytime you fire a query, Application layer has to get details from Database.

In 3 tier, when you fire a query, Application Layer checks whether it already has the data request. If it has the data, then it doesnt hit Database layer, & sends the data to Presentation layer. Hence the response is fast.

In 2 tier, everytime Database is hit, so response is slow.

Best regards,

Prashant

[Former Member]

Thank you all....

[Former Member]

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