BASIS Components

• BASIS Overview

• Sizing the SAP System

• Installation Concepts

• SAP System Landscape

• Client Administration

• Change Management in SAP (Software Logistics)

• Users and Authorization

• OSS and Saprouter

• Role of BASIS Consultants in SAP Implementation

BASIS Overview

• What is BASIS ?

• What is an SAP instance ?

• SAP’s three tier architecture

– Presentation Layer (SAPgui)

– Application Layer

– Database Layer

BASIS Components

BASIS Layer

R/3 Application Components(Logistics, Accounting, HR etc.)

Database Layer

Operating System / Hardware

AB

AP

Workbench

Application Layer

• Dispatcher

• R/3 Work Processes

–D Dialog

–V Update

–E Enqueue

–B Batch (Background)

–M Message

–G Gateway

–S Spool

Database Layer

• Consists of a relational database (Oracle, Informix, DB2 etc.)

• Every work process makes a connect to the database

• Communication between Application Layer and Database Layer is

on Open SQL

• Table Types in the SAP

– Transparent Tables (1:1) relation with the RDBMS Data Dictionary

– Table Pools

– Table Clusters

SAP Instance

• Every SAP installation must have a Central Instance

• There can be multiple dialog instances (application servers) but

never more than one central instance in a R/3 system

• An R/3 system can have only a single database which belongs to

that system.

Sizing the SAP system

• SAP system sizing can be done broadly using 2 methods

–User Based sizing

–Transaction based sizing

• Factors that are considered during the sizing–Number of modules, components add-ons etc.–Number of users–Concurrency of users–User categorization (Low, Medium, High)–Expected database growth–Load from batch processing–Load from reporting–Level of fault tolerance, availability required

Installation Concepts

• SAP Installation is carried out using a tool called R3SETUP

• Supported modes of installation

–Central Instance + database

–Stand alone Central Instance

–Stand Alone Database

–Dialog Instance (Application server)

–Stand alone gateway server

System Landscape

• Different Types of Landscapes Supported

–Single System Landscape

–Two System Landscape

–Three System Landscape

–Multi system landscape

• Setting up the Transport Management System

• System Change Options

Client Management and Administration

• Client is an independently accountable business unit

• Standard Clients available in an SAP System

• Client Creation

• Client copy and copy profiles

• Client Deletion

• Client Roles and Change Options

• What is a good client deployment and refresh strategy ?

Software Logistics

• Change Management in SAP is achieved through the Correction

and Transport System

• Change Management in SAP has three components, Transport

Organizer, TMS and Transport Tools (tp, R3trans)

• SAP provides a mechanism of Change Requests for recording

changes made to the SAP system and to move these changes to

other R/3 systems

• Types of Requests

• Concept of Original / Non-original objects

• Creation and release of Change Requests

• Importing Change Requests into Target Systems

• Transport Management System

Users and Authorization

• Concepts of Authorization Objects, Authorization, Profiles.

• All authorization in SAP system are managed through the Profile

Generator

• Security Implementation in SAP

OSS and SAPRouter

• OSS (Online Service System) is used for message posting, object

registration, license keys, notes etc.

• Some of other support offerings through OSS is Remote Support

sessions, Earlywatch alerts, Earlywatch sessions, Go-Live check,

Upgrade checks etc.

• Currently OSS connections are available on Frame Relay Link,

ISDN.

• SAPRouter is like a firewall which allows you to restrict access to

SAP systems from end users

• Has a provision for building ACL’s which can block users based on

IP addresses, TCP ports, subnets etc.

Basis Role

• Preparation Phase–System Sizing–System Landscape–Client Deployment and Refresh–Transport Strategy–Backup Strategy–Disaster Recovery–Daily Operations Strategy

• Installation and Commissioning of SAP systems• Database Administration• Software Logistics Management• Security Management• Maintenance & Support