These lessons allow you to learn and practice some of the basic skills used throughout SAP, and each lesson includes: •. Overview and Objectives: the purpose. Overview of the Most Critical SAP Products. . SAP from the Turn of the Millennium to the Present 2 The Central Component: SAP ERP . What are Enterprise Resource Planning (ERP) Systems? ERP /SAP. 3. Who are the big ERP vendors? SAP, the German juggernaut . longmogedwapor.cf SAP.
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SAP Tutorial in PDF - Free tutorials and references for SAP, Evolution of SAP AG, Introduction To ERP, SAP Modules, SAP Architecture and GUI, SAP Net. SAP's main products are SAP ERP (formerly known as SAP R/3) and SAP Business Objects software. SAP HANA Tutorials and PDF training materials. Version Authors Bret Wagner. Stefan Weidner. Stephen Tracy. Product. SAP ERP Global Bike Inc. Level. Beginner. Focus. Cross-functional integration.
For example, it is possible to install all three SAP tiers on a single computer for demo purposes.
On the other hand, large SAP productive installations require multiple powerful servers for each of the tiers in order to ensure good performance of the SAP system. Above these tiers, SAP architecture can be further segmented into several application modules. Each module contains the SAP application programs and business data related to a specific business area such as financial accounting FI or materials management MM.
For this reason, our article is not going to focus on any particular SAP module but will instead explain how does SAP work with the three-tier architecture in general. As it was explained above, the heart or kernel of the SAP system is in the application tier application server.
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Furthermore, it stores data in the database tier. All kernel processes that are started or stopped are called an SAP instance. SAP ERP system typically contains several instances in such a way that each instance is running on a dedicated server computer.
Each SAP instance contains a dispatcher and several work processes.
The dispatcher distributes tasks to one of the work processes. The SAP system has different kinds of work processes that were created for various tasks. Here is the list of their types: D: Dialog work processes which are responsible for handling online transactional requests from users. B: Batch work processes which are responsible for processing background jobs scheduled in the SAP system.
V: Update work processes which are responsible for carrying out updates in the database. These updates can happen asynchronously to batch and dialog processes. S: Spool work processes which are responsible for enabling printing in the SAP system. Only one gateway work process is needed per one SAP system. Figure 3 illustrates a generic SAP application instance with one dispatcher and several work processes. The central instance has two additional components called the message process M and the enqueue server E.
The message process M of the central instance is used for establishing communication between various application instances included in the SAP system. For instance, when a user logins to the SAP system, it is automatically assigned by the message process to one of the available application instances.
Next, all the transactional requests related to this user will be re-routed by the message process to the chosen application instance.
Advertisement The enqueue server E of the central instance is used for managing locks on the database tables. These locks ensure that database updates are performed in a proper sequence and guarantee consistency of the business data.
The central instance is schematically illustrated on Figure 4.
SAP system works in the following way: A request arrives from the presentation tier it can be an online request from a user or a request related to a batch job or anything else. This request is analyzed by the dispatcher of the SAP central instance. The dispatcher passes the request to the message process M. The message process M decided whether this request should be processed on this instance or needs to be forwarded to a different instance for example, an instance with a lower computing load.
If the request remains at the same instance, it is put in one of the work processes of the appropriate type for instance, if it an online request from a user, it should be placed in the dialog work process.
The request gets processed by the work process, and if necessary, the SAP system will commit an update to the database through the enqueue server E. The feedback about outcome of the request is delivered back to the originator of the request in a reversed order.
Hands-on with SAP ERP and IDES
This explanation of how does SAP work could be a little bit difficult to follow, and therefore, let us consider a simple example that will hopefully make understanding easier.
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SAP ERP applications give the flexibility to report performance by a business unit, organization or cost center in an efficient way. SAP is also reputed for providing training to the downloaders and students who are interested in building a career in SAP.Preview in PDFeditor: WordPress Shortcode.
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S: Spool work processes which are responsible for enabling printing in the SAP system.