What are SAP ERP Architecture Models?

What are Architecture Models in SAP ERP? What are SAP R/1, R/2, R/3 Architectures? What are the differences between SAP R/1, R/2 and R/3?

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There are three architecture models which existed in SAP ERP.
  1. R/1 : 1 - Tier Architecture
  2. R/2 : 2 - Tier Architecture
  3. R/3 : 3 - Tier Architecture
Here, "R" stands for Real Time Data Processing.

R/1 : 1 - Tier Architecture

SAP R/1 is a Single Layer Architecture application in which all three components Presentation, Application and Database are merged and installed in one system/Server.

SAP 1 Tier Architecture

R/2 : 2 - Tier Architecture

SAP R/2 is a Two Layer Architecture application in which all three components Presentation, Application and Database are merged and installed in two systems/Servers.

In R/2, Presentation component is installed in one System/Server and
Application component and Database component is installed in other system/server.

SAP 2 Tier Architecture

R/3 : 3 - Tier Architecture

SAP R/3 is a Three Layer Architecture application in which all three components Presentation, Application and Database are installed in three systems/Servers.

In R/3, Presentation component is installed in one System/Server and
Application component is installed in other system/server
Database component is installed in other system/server.

SAP 3 Tier Architecture

Note: Please refer standard SAP library for full documentation about SAP Architecture

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