sap abap online training by keylabstraining
TRANSCRIPT
SAP Architecture & Overview
Systems Applications & Products
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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
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ApplicationApplication
DatabaseDatabase
PresentationPresentation
Database applicationpresentation processes
One -tierconfiguration
Two -tierconfiguration
Three -tierconfiguration
Presentation processes
Databaseapplication processes
Databaseprocesses
Application processes
SAP R/3 : 3 Tier Architecture
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Those SAP R/3 software components that
specialize in the management , storage and
retrieval of data form the Database Layer
The Database Layer
Those SAP R/3 software components that
specialize in processing business
applications form the Application Layer.
The Application Layer
Those SAP R/3 software components that
specialize in interacting with end-users
form the Presentation Layer.
The Presentation Layer
SAP R/3 : 3 Tier Architecture
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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
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Application ServerPresentation . . . Internet
Application
Database
Communication
SAPGUISAPGUI InternetOffice
Work-
process
Work-
process
Work-
process
Dispatcher
TCP/IP
Remote SQL
IPC
Local Bufferfor R/3 Data,
DW-Objects,
ABAP-Objects
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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
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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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Different Kind of Work Processes for different Tasks
Dialog
SAP DispatcherBatch
Spool
Update
Enqueue
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Message
Gateway
R/2 R/3
V
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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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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
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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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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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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
UpdateV
Integration
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S
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C
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T
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M
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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
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ABAP
Programs
Configuration
Organization Structure
Key Data Elements
Functionality Configurations
ApplicationMaster Data
Transaction Data
Understanding the Logon Client
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000
001
066
800
Client Copy
Data in SAP System
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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
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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 ?
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SAP R/3 scope
Specific company
requirements
Non SAP
applications
New Functionality
Development