The document provides an overview of SAP architecture, detailing the R/1 and R/2 systems, their evolution, and their role in serving large multinational corporations. It outlines the different work processes involved in the R/3 system, including dialog, background, spool, enqueue, and update work processes, emphasizing their functions and importance in managing tasks within the system. Additionally, it highlights the significance of ABAP programming in creating and managing applications within the SAP environment.

1. Systems Applications & Products
• SAP Architecture & Overview

2. SAP R/1 , R/2
 The R/2 system
 Reorganized as leading mainframe software for large multinational
corporations
 4,300 copies worldwide in 1993
 Mainframe-based to replace user legacy software;
co-existence and migration strategy underway for R/2 and R/3
 The R/1 system
 Developed for ICI Chemical
 Released 1972
 Focused on Sales & Distribution and Materials Management
 Discontinued after release of R/2
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3. Dispatcher Tasks
• Balances the workload between the
processes
• Buffer management in main memory
• Connection with the presentation level
• Organization of the communication processes
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4. Different Kind of Work Processes for different Tasks
Dialog
SAP DispatcherBatch
Spool
Update
Enqueue
S
12
9
6
3
11 1
7 5
8 4
210
B
M
G
Message
Gateway
R/2 R/3
V
E
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5. Dialog Work Processes
Dialog
• Responsible for the interactive tasks of the
R/3 system
• Dialog work processes execute only one
dialog step at a time and are immediately
freed for the next user request
• Constantly switching between users
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6. Background Work Processes
• Responsible for executing ABAP
programs submitted for background
execution
• Batch jobs schedule the sequence of
program execution
• Used for running long and time
consuming programs
Batch
12
9
6
3
11 1
7 5
8 4
210
B
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7. Spool Work Processes
• Responsible for formatting the data for
printing and passing it to the host spool
system
• Only one spool work process allowed
per server
Spool
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8. Enqueue Work Processes
• Responsible for the lock management
system
• Synchronizes database access for the
multiple application servers and work
processes
• Only one enqueue process per R/3
system to ensure data integrity
Enqueue
E
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9. Update Work Processes
• Responsible for making database
changes requested by dialog and
background processes
• For better performance, this process
should be on the database server
Update
V
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10. Integration
S
U
P
P
L
I
E
R
C
U
S
T
O
M
E
R
S A P R / 3
Procurement Production Distribution
Finance and Accounting
MM PP SD
FI CO
All business processes throughout the supply chain are executed in
one system sharing all information
Workflow
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11. SAP R/3 : Components
ABAP
Programs
Configuration
Organization Structure
Key Data Elements
Functionality Configurations
Application
Master Data
Transaction Data
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12. Understanding the Logon Client
000
001
066
800
Client Copy
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13. Login Screen
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14. Data in SAP System
1. Client-dependent Data
(Client-Specific)
2. Client-independent Data
(Cross-Client)
User Master
Customizing
Application
Master
Transaction
Customizing
Repository
configurations
≈ xxxx tables
≈ xx,xxx tables
e.g. printer
ABAP programs
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15. ABAP Programming
 SAP R/3 applications are written in the ABAP programming language, and
run within the application layer of the R/3 System.
 ABAP programs communicate with the database management system of the
central relational database (RDBMS), and with the graphical user interface
(SAP GUI) at presentation level.
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16. Why do we need ABAP Development ?
SAP R/3 scope
Specific company
requirements
Non SAP
applications
New Functionality
Development
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