SAP R3 System: Client Server Overview BuckEmden

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SAP R/3 System Client Server Overview(Buck-Emd
en Galimow, 1998)

• Dr. K. Palaniappan
• Dept. of Computer Engineering Computer Science,
  UMC

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Business Data Processing

• Radical changes
• Information Management
• The deciding competitive factor
• Short innovation cycles, global competition, high
  costs
• Enterprise-wide information/resource management

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Business Data Processing

• Corporate Competitiveness
• Business re-engineering optimization of all
  business processes along with the entire
  net-value added chain
• Technology re-engineering use latest data
  processing (DP) technology for optimization of
  ERM, ERP
• Past Function Orientation
• Business data processing administrative support
  for functions like accounting, materials
  management, etc.

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Business Data Processing

• vs Present Customer Orientation
• Optimization of entire business process
• DP support for business process reduce
  inventory, improve delivery, flexibility, improve
  quality, minimize cost, etc.

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Requirements for EIM

• Functional
• Online integration of all business applications
  and data in the company vs (obsolete centralized
  with alphanumeric screen-based) batch processing
• Timely provision of operational business
  information
• Universal support of customer/firm/vendor
  business processes
• Customization and adaptation to changing business
  conditions
• Data and program integration with desktop tools
• Intuitive, consistent user interfaces

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Requirements for EIM

• Technical and Administrative
• Cost of DP infrastructure
• Portability of business application software
• Lifespan of ten or more years vs hardware,
  software, communication technology changes
• Scalability to varying load profiles
• Short predictable online response time
• High throughput of background jobs
• 24-hour availability
• Easy systems administration
• Short downtime during release changes

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Requirements for EIM

• Re-orientation of in-house software development
• Too expensive
• Continual business requirement changes
• Rapid infrastructure changes
• Unpredictable software innovations

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Component Software as a New Solution

• Not possible to produce integrated software with
  all of the functions and modules described by the
  customer
• Software component reuse
• Integration of application modules
• Microsoft OLE (object Linking and Embedding)
• OMG CORBA (Object Management Group Common Object
  Request Broker Architecture)
• Interoperability between different vendor
  software
• Object oriented (Smalltalk, C, Java,) vs
  Procedural languages (COBOL, C, ABAP/4,)

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New Technologies for Business DP

• Client-server computing, GUI, multimedia,
  broadband networks
• Wireless networks, thin clients, speech
  processing, Internet/Web, XML
• Middleware
• Software that sits between business applications
  and hardware operating system
• Critical for client-server applications
  development (key enabling technology)

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Essential Tools of Middleware

• Isolate applications from specific hardware and
  system software interfaces (i.e. printing, window
  management, network, POS, ATM, DBMS, etc.)
• Provide open communication interfaces for
  distributed application
• Control and monitor distributed transactions
• Access different distributed data sources
• Provide object management functions

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Classes of Middleware (Gartner Group)

• Middleware for data management
• Remote file systems (i.e. UNIX NFS)
• Database tools and interfaces
• Middleware for support of distributed functions
• Communications (sockets, etc.)
• Remote procedure calls
• Database expansions (replication, mirroring,
  etc.)
• Transaction monitors
• 4 GL runtime environments
• Object management

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Client-Server Computing

• Hardware view vs software view
• Computer networks programs that operate on
  different computers and asynchronous calls
• Calling program client or master
• Called program server or slave

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Client-Server Configurations

• Centralized system
• Distributed presentation
• Database access across computer boundaries
• Three layer client/server system with distributed
  presentation, distributed application logic, and
  database access across computer boundaries
• Multilayer client/server systems with cooperative
  processing

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Technical Foundation for Client/Server Systems

• Hardware systems CPUs and memory
• High performance local and wide area networks
• System software

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