Special Edition Using SAP R/3, Third Edition

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Special Edition Using SAP R/3, Third Edition - CH 3 - Exploring R/3 Architecture Page 24 of 26 and written to the technical subsystem interface is error-free and complete. TCP/IP can be used to establish a link through other computers using the Internet Protocol. The flow of data can also be carried out using CPI-C. Distributed Satellite Systems The principle of establishing satellite systems that can operate locally and also integrate fully with a central R/2 or R/3 system offers the following advantages: The individual local systems can be implemented to best use the equipment and other resources available. The local system may be able to take advantage of low-cost computing power. By using SAP standard interfaces, the satellites do not have to be SAP systems or R/3 applications; they can be legacy systems already fully operational and responsible for storing specialized data. The local system can run without continuous reference to the central host system, which is thereby relieved of some workload that can be scheduled for more convenient times. Applications as Satellites Here are some applications that have successfully operated in the satellite manner: DASS production control station EIS-Executive Information System Treasury Workstation Components of the HR-Human Resources Management System LVS-Warehouse Management System The international operation of distributed applications is discussed in Chapter 9, "Building Global Business Systems." Reliability and Security An R/3 implementation is in a critical role at the center of the management focus of your company. The applications integrated with the R/3 system must be reliable and available to users. The functions in all the applications must work correctly. The necessary data must be available when required. In addition, the integrity of the data must be absolute. file://J:\prodinfo\MEMBERS\MA\ir057.html 3/23/01
Special Edition Using SAP R/3, Third Edition - CH 3 - Exploring R/3 Architecture Page 25 of 26 CAUTION The confidentiality of the data and the applications must be strictly maintained by a structure of authorizations. No data or software code must be altered or corrupted, either intentionally or by accident. Functionality of the Software The first consideration when assessing the capability of a piece of software to do the job intended, completely and exclusively, must be the methods used to design and build it. However extensive the testing of software, it is unlikely that all problem situations are encountered, so there must be a degree of doubt as to the absolute reliability of the package. This degree of uncertainty can be made as small as possible by extending the scope of the prerelease testing. Many legacy computer programs have generated maintenance expenses many times their development cost, because they were not fully specified in the first instance and not thoroughly elaborated at the design stage. Several chapters in this book are devoted to the SAP tools for designing and developing reliable and efficient programs. Security Levels and Confidentiality The security of the data and software in the R/3 system and applications must be addressed at several levels: Desktop presentation system level Application level Database level Operating system level Network level The SAP approach to managing the security of a complex system across all these levels is to establish a set of internal and external security services: R/3 internal security services, which concern the desktop systems, application servers, database servers, and network communications at the application level Database security services, which are provided by the database computer System security services, which are assisted by the ease with which the R/3 system can be reconfigured without a loss of services if any subsystem comes offline Network security services Reliability and Availability Through Support file://J:\prodinfo\MEMBERS\MA\ir057.html 3/23/01
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Special Edition Using SAP R/3, Third Edition

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