Sap abap online training By Keylabstraining

SAP Architecture & Overview
 Systems Applications & Products
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info@keylabstraining.com

SAP R/1 , R/2
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 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

SAP System Configuration
ApplicationApplication
DatabaseDatabase
PresentationPresentation
Database application
presentation processes
One -tier
configuration
Two -tier
configuration
Three -tier
configuration
Presentation processes
Database
application processes
Database
processes
Application processes

SAP R/3 : 3 Tier Architecture
Those SAP R/3 software components that
specialize in the management , storage and
retrieval of data form the Database Layer
The Database Layer
specialize in processing business
applications form the Application Layer.
The Application Layer
specialize in interacting with end-users
form the Presentation Layer.
The Presentation Layer

SAP R/3 : 3 Tier Architecture
The Database Layer
components are installed on
high-end database server.
The Application Layer
components are installed
across one or more high-
end servers.
Presentation Layer components are installed across many PCs

What happens when I send a
request to SAP?

Application Server
Presentation . . . Internet
Application
Database
Communication
SAPGUISAPGUI InternetOffice
Work-
process
Work-
process
Work-
process
Dispatcher
TCP/IP
Remote SQL
IPC
Local Buffer
for R/3 Data,
DW-Objects,
ABAP-Objects

Dispatcher
• Program which manages resources of the R/3
applications
• Receives requests from user and passes them
to the corresponding work processes
• Only one dispatcher per application server

Dispatcher Tasks
• Balances the workload between the
processes
• Buffer management in main memory
• Connection with the presentation level
• Organization of the communication processes

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

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

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

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

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

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

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

SAP R/3 : Components
ABAP
Programs
Configuration
Organization Structure
Key Data Elements
Functionality Configurations
Application
Master Data
Transaction Data

Understanding the Logon Client
000
001
066
800
Client Copy

Login Screen

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

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.

Why do we need ABAP Development ?
SAP R/3 scope
Specific company
requirements
Non SAP
applications
New Functionality
Development

Sap abap online training By Keylabstraining

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