ssrs barcode font not printing Building the Client/Server SAP R/3 System in Software

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Building the Client/Server SAP R/3 System
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Once all the processes and components which make up the SAP system are known, we can see how all these pieces come together to form a whole client/server R/3 system. The starting point is a server system (hardware point of view) with the required memory, disks, network controller cards, and operating system. On this first server, add the relational database management system with its corresponding database processes. At this moment, you have the database server. The database is, of course, installed on the disks connected to this computer server. Now, add basic R/3 services (work processes). We have added a printer to this system to get a connection between the SAP spool work process and the host spool system. Generically, we link the update and the enqueue work processes to the database. But, as stated in previous sections, there is a database interface component within the dialog and the background work processes that 58
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The Concept of a SAP Instance can directly access the database, too. At this moment, you have the database server and the SAP central instance (because it has all the basic services). From a software client/server point of view, the services provided by the central instance make up an application server. When the central instance and the database are running together on the same machine, which is usual, this is known as a database server with central instance, or simply a database server. In the SAP naming convention, a service is a process (such as the message process) or a group of work processes. It is a software concept, and the component that offers those services is called a server. The software components which request those services are known as the clients. The clients can be servers at the same time. Since there already is a dispatcher process and dialog work processes, it is possible for presentation servers (clients) to connect to this system (server). It is also possible to configure the directly attached printers or network printers to the SAP system. This would be a centralized system or a two tier client/server configuration. Include additional work processes (service types) on a different server, which make up an additional application server. Now it is a SAP R/3 three tiered client/server configuration. A complete SAP system is the set of clients and server components that make use of or are assigned to the same database. The connection between the presentation process and the dispatcher is the one that makes the transition between the presentation and application servers. The update process is the one that makes the separation between the application and database servers.
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3: Installation Concepts and Guidelines
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Overview
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The purpose of this chapter is to introduce the reader to the installation of SAP R/3, the software and hardware components and the concepts involved in setting up the system, and the steps required for a fast and successful installation. The goal is to make the installation process easier and more understandable. This chapter under no circumstances replaces the official SAP installation manuals, since each new R/3 version release might contain differences concerning system set up and installation. Particularly important are the operating system dependencies, where a wrong file or directory permission or incorrect system parameters might lead to R/3 installation errors or unexpected behaviors. The official manuals are often referred to in this chapter. This chapter's guidelines are based on SAP R/3 release 4.5, and are equally applicable to those releases, such as 4.0, that use the R3Setup installation utility. Previous releases used the R3inst installation utility. Observe, though, that installation is a different process than upgrading. Due to the open technology of R/3 and thus the number of supported hardware platforms, operating systems, and databases, it is beyond the scope of this chapter to cover all installation variants. For a single SAP system or group of related systems, customers do not usually install different operating systems and databases, except for performing benchmarks and comparisons. Nevertheless, a mix and match of different hardware systems and even operating systems are supported (for example, UNIX systems as database servers and Windows NT as application servers, OS/390 as standalone database servers, and AIX as application servers). Official SAP installation guides contain detailed instructions on how to proceed in these environments. For more information on the latest status of these types of system setups, contact SAP or look it up in SAPnet (http://sapnet.sap.com). Customer decisions about hardware platforms are quite variable, but UNIX and Windows NT are the two major operating systems selected. ORACLE is one of the preferred databases, with Informix, Microsoft SQL Server, and ADABAS D as other choices. There are of course many AS/400 and OS/390 installations, together with the DB2 databases. To explain the making of the decision among different vendors or operating system architectures is beyond the scope of this book, and depends on many factors such as overall system size (number of users, estimated size of database, R/3 business modules to be implemented, batch load, etc.), budget, expected response time threshold, former database know how, and so on. For the instructive purposes in this book, examples are shown and explained using both UNIX and Windows NT as operating system, and ORACLE and SQL Server as database, although the general guidelines are completely valid for all other database engines. The only difference would be in the process of designing the file system layout and the actual installation and configuration of the database itself. Caution If you have a system to use in a nonproductive environment, you can follow these instructions together with those from the SAP manuals, but be aware that the actual installation for productive purposes should only be done by certified SAP R/3 installers; otherwise, SAP does not guarantee its support. It is equally important not to play with installation programs and utilities since that might lead to a complete loss of or extensive damage to files already installed.
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