sap r 3 full report
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SAP R3 ARCHITECTURE.
SAP R/3 is a standard software package for business applications. It integrates most of the currently run business applications in a single package. The software was developed by SAP AG company. SAP stands for systems, applications, products in data processing. SAP R/3 is a standard package which can be configured in multiple areas and adapted to specific needs of a company. To support those needs, SAP includes a large number of business functions, leaving room for further functionality and enhancements or adaptability to business practice changes.
The topic covers the functional diagram of R/3 software, the need of client/server architecture, the development environment provided by the software, the terms such as transaction, dialog steps, LUW etc ,the systems central interfaces, and the applications .The environment provided for development is ABAP/4 development work bench which allows us to integrate the applications according to the needs of our use as well as for developing new applications. In the central interfaces, operating system interface is the most prominent one. Others are database interface, presentation interface, and communication interfaces. It also covers the services provided such as dialog service, message service, gateway service, spool service, background service, and update service.
SAP R/3's nucleus is the basis software also known as kernel. Kernel is responsible for integration of all the applications in the R/3 software.
After the Internet, sap r/3 is one of the hottest topics in the computer industry, and the company that developed it, SAP AG, has become one of the successful in the software market. The SAP R/3 system is targeted to most industries: manufacturing, retail, oil and gas, electricity, health care, pharmaceutical, banking, insurance, telecommunications, transport, automotive, chemical, and so on. All hard ware vendors, without exception, are fully engaged to partner with SAP: currently, AT&T, Bull, Compaq, Data General, Digital, Hewlett-Packard, IBM, Pyramid, Sequent, Siemens-Nixdorf, and SUN has supported and certified SAP R/3 platforms.
SAP AG was found in 1972 by four former IBM employees. Since its foundation, SAP has made significant development and marketing efforts on standard application software, being a global market player with its R/2 system for mainframe applications and its R/3 system for open client/server technologies.
The company name SAP stands for Systems, Applications and Products in Data Processing. It is a standard software package that can be configured in multiple areas and adapted to specific needs of the company. To support those needs, SAP includes large number of business functions, leaving room for further enhancements or adaptability to business practice changes.
The lower layer is made of operating system, physical database (whose software is included in the SAP kit), and the network. The middleware layer, which is above it, interfaces with the lower one and integrates SAP applications on top of it. This middle layer is known as the basis system, or R/3 kernel, and includes components such as the ABAP/4 development work bench, the system administration tools, batch job handling, authorization and security management, and all cross application modules.
ABAP/4 is the $GL (fourth-generation programming language) in which all R/3 applications (the upper layer) are developed. Middleware are the layered software components that facilitate the development of client/server applications that can be deployed in heterogeneous vendor platforms. The basis system, also known as kernel, is the SAP R/3 middleware.
The upper layer, the functional layer, contains the different business applications: financial, human resources, sales and distribution, materials management, and so on. The integration of all applications relies on the basis system.
The R/3 kernel makes use of standard communications and application program interfaces to access the operating system, the database, and the network. This architecture allows users to change system configuration and install new systems without interrupting or altering the applications themselves.
In general client/server is a style of computing that distributes the workload of a computer application across several cooperating computer programs. This type of computing separates user-oriented, application, and data management tasks. Client/server is mainly a software concept that includes a set of service providers and service requesters. In client/server computing, individual software components act as service providers, service requesters, or both. These software services communicate with each other via predefined interfaces.
Major advantages of the client/server approach are as follows:
Â¢ Flexible configuration. With the deployment of standard communication interfaces, there are many possibilities for planning a client/sever installation: from a centralized configuration to a highly distributed system.
Â¢ Workload distribution. Since application servers work in parallel, and communicate with the data base, users can be evenly distributed based on their job tasks. Also there is the possibility of deploying dedicated application servers to specific business areas.
Â¢ High scalability. Client/server permits users to adapt their capacity of their hardware according to the performance needs of their businesses, such as adding application servers when there is an increase in the number of users, when additional modules start production, and when data base becomes larger. This enables companies to protect their hardware and software investments.
One of the widely used client/server configurations with the R/3 system is the three-tiered architecture, which separates system's computers in to three functional groups: presentation, application, and database. The central server contains the database, widely known as database server. Application servers include the processing logic of the system, including services such as spooling, dispatching user requests, and formatting
The tasks related to presentation of data are handled by the presentation servers, which typically are personal computers or, workstations, enabling easy access to the system.
Communication among the three tiers is accomplished with the use of standard protocol services, such as the one provided by TCP/IP or CPIC.
The key to SAP/R3 success was the strategy of making open solutions, in which applications can run on multiple operating systems, databases, and communication technologies. This enables customers to remain independent of a single vendor if they wish.
ABAP/4 DEVELOPMENT WORKBENCH
ABAP/4 is a 4GL (fourth-generation programming language); the acronym stands for Advanced Business Application Programming Language. It is the SAP programming language used in the development of all standard applications included
On top pf ABAP/4, SAP has designed a full-purpose development environment, known as the ABAP/4 development workbench, which is integrated with R/3 system and is available for customers to develop their own solutions and enhance or extend the capabilities of the existing applications.
It includes all tools necessary to develop and design programs, screens, menus, and so forth. It also contains performance and debugging facilities. Central to the workbench is the ABAP/4 object repository and the data dictionary.
Object repository stores all the development objects of workbench: programs, dictionary data, dynpros (dynamic programs), and documentation. The repository is the key to managing and testing ongoing development. Data dictionary contains the descriptions of the data structures used with in programs. This is metadata repository that includes table definitions, allowed values and relationship between tables.
ARCHITECTURE OF SAP/R3
R/3 BUSINESS APPLICATIONS
ABAP/4 DEVELOPMENT WORKBENCH
OS DATA BASE NET-WORK SAP GUI
UNIX WIND OWS, OS/400
TCP/IP LUG.2 RPC
SAP R/3 MIDDLEWARE
R3 BASIS SOFTWARE
The basis software is the set of programs and tools which interfaces with the computer operating system, the underlying database, the communication protocols, and the presentation interfaces. This software enables R/3 applications to have the same functionality and work exactly the same way no matter what operating system or database the system is installed on. It is an independent layer which integrates all application modules. It is the kernel of SAP R/3 software.
In addition to that R/ 3 basis also provides:
Â¢ The environment for R/3 applications.
Â¢ System administration and monitoring tools.
Â¢ Architectural software client/server design.
Â¢ Authorization and profile management tools.
Â¢ Database monitoring and administration utilities.
The features of the R/3 basis system which enables these types of interfaces are as follows:
Â¢ The client/server architecture and configuration
Â¢ The use of relational database management systems
Â¢ Graphical user interface design for presentation
The R/3 basis system is based on standards: ANSI-C for the programming of the run time environment, Open SQL for embedded SQL calls inside, ABAP/4 for interfacing with the database, communication standards such as TCP/IP, and graphical interfaces such as Microsoft Windows, Motif, or Macintosh.
The R/3 system uses some widely known terms to which SAP gives some specific meanings.
Generally, a transaction is an operation that lets user make changes to a database. The overall R/3 system must be seen as a business transaction processing system.
In the SAP system, a transaction is a sequence of related steps. These logically related steps, known as dialog steps, are screens in which the data is introduced causing the generation of other events. There is a special transaction monitor, the SAP dispatcher, which takes care of handling the sequence of those steps.
The final task of transaction is to modify the information which ultimately goes in to the database. The transactions usually contain two phases: an interactive phase and an update phase. The interactive phase may be at least one step, but can have many. This phase is responsible for preparing the database records that can update the database. The update may be one step or many. This phase processes the previously prepared records and updates the database.
A dialog step is a SAP R/3 screen, which is represented by a dynpro. A dynpro, or dynamic program, consists of a screen and associated processing logic. A dialog step is controlled exactly by a dydpro.
LOGICAL UNITS OF WORK (LUWs)
Conceptually, a logical unit of work (LUW) is an elementary processing step which works as a locking mechanism to protect the transactions integrity. A LUW is a set of steps with in a transaction, and all those steps must be correctly completed to go ahead with transaction logic. If there are errors before the end of transactions, the current LUW is canceled, but not the previous ones.
Three kinds of work processes can be distinguished.
Â¢ A database transaction, known as LUW or database LUW, is the period of time in which the operation requested must be performed as a unit. This is an all nothing operation, i.e. at the end of LUW either changes are committed or they are rolled back.
Â¢ An update transaction or SAP LUW is the equivalent to the database concept for the SAP systems. Generally it consists of numerous database LUWs.
Â¢ ASAP transaction or ABAP transaction is made up of set of related tasks combined under one transaction code.
SYSTEM CENTRAL INTERFACES
The R/3 middle ware is made of central interfaces as shown in
Â¢ The interface with the operating system.
Â¢ The interface with the database.
The interface for presentation.
Communication can be seen as a special type of interface
which directly or indirectly is present in the other three types.
For compatibility and portability reasons, all these interfaces are grouped together in the central interface functions of the SAP system kernel.
OPERATING SYSTEM INTERFACE
One of the main task of the operating system inter face is to guarantee the portability of the whole system. This done using an internal portability layer.This layer offers to the applications nearest services to the system, such as message handling and memory management, independently of the platform and optimized for performance. The inherent openness of R/3 makes it run over different operating systems, which has to be POSIX standard-compliant.
The mission of system interfaces is to provide services such as scheduling, memory management, and similar tasks, which could be partially done by the operating system software, but SAP executes them internally for portability reasons. The R/3 run time environment is written in ANSI-C, but all application programs inside R/3 are written in the interpreted programming language ABAP/4 developed by SAP.
The components in charge of controlling the user dialogs are the dynpros. The technology base for R/3 application is made of the interrelation of the dynpro interpreters and the ABAP/4 language.
From the view point of the operating system, the runtime system of R/3 can be seen as a group of parallel processes (work process). Among these processes there is a special one, the dispatcher, which controls and assigns tasks to the other processes.
The SAP dispatcher is the control program which manages the resources of the R/3 applications. It works as a typical transaction monitor which receives screens and data from the presentation services and passes them to the corresponding work processes.
Using client/server terminology, a work process is a service offered by the server and requested by the client. Dispatcher manages the information exchange between the SAPGUIs and the work processes, enabling users to share the different work processes available.
Main tasks of dispatcher are as follows:
Â¢ Balanced assignment of the transaction load to the work processes.
Â¢ Buffer management in main memory.
Â¢ Connection with presentation level.
Â¢ Organization of communication processes.
SAP DISPATCHER PROCESS
The logical flow of execution of a user request follows:
1. Users enter data in the presentation server; the data is received by SAPGUI, converted to a SAP format, and send to the dispatcher.
2. Initially, the dispatcher keeps the requests in queues, where the dispatcher later processes them one by one.
3. The dispatcher allocates the user requests using the free work processes. The real execution takes place inside the work processes themselves.
4. At the end of execution, the result of the work process task goes back to the SAPGUI through the dispatcher. SAPGUI interprets the received data and fills up the user screen.
Dataflow in dialog steps
SAP has optimized the data flow between the presentation and application servers. Typically the quantity of data that goes in the network from dispatcher to the SAPGUI does not exceed 2K.The communication is established via standard TCP/IP sockets.
The dispatcher has a special advanced program-to-program communication (APPC) server built in to it which communicates and responds to requests submitted by the work processes. On each application server there is one dispatcher but multiple work processes.
WORK PROCESS ARCHITECTURE
ABAP/4 processor Dialog InterpreÃ‚Â¬ter Database Interface
A work process is a program in charge of execution the R/3 application tasks. It consists of a task handler, ABAP/4 processor, dialog interpreter, and database interface. Activities inside the work process are coordinated by task handler. It is the control program inside the work process. The processing of the codes of the application program is done by ABAP/4 processor. Dialog interpreter manages the user dialogs. The database interface allows the work processes to establish direct links with the database.
SERVICES: WORK PROCESS TYPES
Depending on the type of services provided work processes are: dialog, batch, update, enqueue, spool, message, and gateway.
DIALOG WORK PROCESS
A dialog work process is in charge of the interactive tasks of the R/3 system. Dialog work processes execute just one single dialog step at a time and becomes immediately available for the next user request, which is assigned by the dispatcher.
BACKGROUND WORK PROCESS
Dialog work Process
The back ground work processes are in charge of executing ABAP/4 programs submitted by for background execution. The ABAP/4 programs submitted for background processing are executed in the planned time by the background work processes.
Spool work process is in charge of formatting the data for printing and passing it to the host spool system. The spool requests, indicating the printer and the printing format of the spool request, are generated during dialog or background processing and are held in spool database.
ENQUEUE WORK PROCESS
Enqueue work process is in charge of lock management system. In order for the system to run in a consistent manner, it must ensure that when a transaction's dialog steps are handled by different work processes, they retain the assigned locks until the end if the transaction or intentional release of lock, even when switching work processes.
Locks are managed by the enqueue work process using lock table which resides in the main memory. Locking objects are of two types: type S, object that can be shared, type E, objects that cannot be shared.
UPDATE WORK PROCESS
The update work process is in charge of executing database changes when requested by the dialog or background work processes. A dialog program first generates log records in the VBLOG table, which are then passed by the update program once dialog is finished. The update log record can have two components, primary update component (V1) and secondary update component (V2). Time critical processes are held inside the V1, less critical ones inside V2.
1. Create update request
2. Send update message
3. Read update request
4. Implement update
The message server is a service used by the different application servers to exchange data and internal messages. There is only one message server per R/3 system. Every application server has a unique name for the message server.
The gateway services allow the communication between R/3, R/2, and external applications.
The presentation interface is the component is in charge of making functionally equivalent the presentation and handling of R/3, no matter the type of front end used.
The connection between the SAPGUIs and the SAP dispatcher is made with an optimized protocol, in which small data packets are send through the network. The presentation interface allows for upload and download functions from the application server.
The underlying database of he SAP/ 3 system acts as the main container for all the information managed by the system. The database interface supports different relational databases from different vendors. The main task of the database interface is to convert SQL requests from the SAP development environment to the database's own SQL requests.
SAP R3 COMMUNICATION PROTOCOLS AND INTERFACES
Inside R/3, communication is an overall process which involves most of the components of the systems both internally and to the exterior world. At the operating system level, the protocol used is TCP/IP. Communication with the database is accomplished using remote SQL calls. Between applications there are many programming interfaces which use an underlying communication layer, such as CPIC, RFC, ALE, and EDI.
The communication interfaces are employed to integrate all the layers of the client/server architecture, from database server to application server to presentation servers. Additionally they define channels for exchange of information.
The R/3 applications are usually categorized in three core functional areas: financial, logistics, human resources. Additionally SAP actively develops special software packages on top of R/3, targeted to specialized vertical industries.
SAP financial modules give customers the whole picture of accounting functions, with excessive report facilities to allow for fast decision-making support. They are also suited for international corporations with multiple subsidiaries, including support for foreign currencies and multilingual capabilities.
HR modules include all necessary business processes to efficiently manage all the needs of a company's human resource area- application screening to payroll accounting or personnel development.
Logistics applications manage all processes involved in the supply chain of goods: from raw material procurement to final customer delivery and billing.
Looking from whole point of view SAP R/3 is one of the suitable software for managing large number of business processes. SAP AG provides online service systems for administration and guidance. It provides consulting, information and maintenance services for the customers of SAP/3 software. Thus SAP R/3 would be the most suitable software package to almost every industrial application for medium as well as large scale industries.
1. USING SAP R/3 BY: ASAP WORLD CONSULTANCY AND JONATHAN BLAIN
2. THE SAP R/3 HAND BOOK BY: JOSE ANTONIO HERNANDEZ
2. FUNCTIONAL DIAGRAM
3. CLIENT-SERVER SOLUTION
4. ABAP/4 DEVELOPMENT WORKBENCH
5. ARCHITECTURE OF SAP/R3
6. ARCHITECTURAL CONCEPTS
7. SYSTEM CENTRAL INTERFACES
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Structural Analysis Program- SAP
What does SAP stands for? (Erasing wrong ideology and placing debut)
It's a question that haunts everyone. , people are troubled by acronyms they don't understand. Whether they need to know the answer is not relevant; their troubles will continue until their brains have a satisfactory definition. To this day, I receive frequent questions asking me to explain what SAP stands for. I guess I should be grateful for questions;. with me trying to decide whether to blurt out: “Don't say ‘sap’, say ‘S’ ‘A’ ‘P’.”
Surprising factoid: over the days, many of the folks who asked me what SAP stands for were not even interested in the field of SAP. They were simply in the middle of conducting some online business and were annoyed to run into an acronym they could not decipher.
The most common member of the “what does SAP stand for” gang is the “I'm new to SAP” person, or, more accurately, the “I want to be new to SAP” person.. When someone asked me, “What does SAP stand for,” I gave them the wrong answer. “Structural Analysis Program,” I told them, with all the certainty of a world-class expert. This definition is, of course, patently and completely wrong. I will say, in my defense, that it sounds cooler than any official definition.
“Structural Analysis Program” rolls off the tongue with an authority that suits one of the biggest software companies in the world. Unfortunately, we can't start a movement to turn this into the actual definition because it doesn't make any sense, and never did. In the mid-90s, SAP was much more operational than analytical. In The beginning it was a bit credence to my assertion of “structural analysis”, but the release of Knowledge and the integration of unstructured data into SAP renders my so-called definition permanently irrelevant. I have no hard feelings about this, but if, at a future ASUG event, I happen to run into the consultants who originally gave me this bad definition, I will tie them to a chair and make them listen to Microsoft's presentation on Mendocino over and over again.
SAP was founded in 1972 as Systemanalyse und Programmentwicklung by five former IBM engineers in Mannheim, Baden-Württemberg (Dietmar Hopp, Hans-Werner Hector, Hasso Plattner, Klaus Tschira, and Claus Wellenreuther).
As part of the Xerox exit strategy from the computer industry, Xerox retained IBM to migrate their business systems to IBM technology. As part of IBM's compensation for the migration, IBM acquired the SDS/SAPE software, reputedly for a contract credit of $80,000. The SAPE software was given by IBM to the founding ex-IBM employees in exchange for founding stock provided to IBM, reputedly 8%. It may be noted that, at the time they left IBM, the ex-employees were quite senior engineers in IBM Germany rather than founding engineers in the sense of Hewlett-Packard's founders.
The acronym was later changed to stand for Systeme, Anwendungen und Produkte in der Datenverarbeitung ("Systems, Applications and Products in Data Processing").
1. In 1976 "SAP GmbH" was founded and the following year it moved headquarters to Walldorf.
2. In August 1988, SAP GmbH transferred into SAP AG (a corporation by German law), and public trading started November 4. Shares are listed on the Frankfurt and Stuttgart stock exchange.
3. SAP AG became the company's official name after the 2005 annual general meeting (AG is short for Aktiengesellschaft).
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