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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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