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You write your programs using the ABAP Development Tools. All the tools for the whole development lifecycle are integrated there and are also part of the server. Thus, you require access and developer authorization for the AS ABAP. In general, you develop on a central server in ABAP. Dynpros are the classical user interfaces of most ABAP-based SAP programs and run in the SAP GUI. Before SAP Fiori, Web Dynpro for ABAP was the SAP standard UI technology for developing Web applications in the ABAP environment. When developing in ABAP you may also encounter browser-based Web Dynpro ABAP/Floorplan Manager technology or Dynpro technology. When writing a business application you should use SAP Fiori UI as a state-of-the-art user interface. Furthermore, it receives data from the application layer and displays it to the user. This layer receives user entries – that is, mouse-clicks and keyboard input – and passes them on to the application layer. The presentation layer represents UI and is responsible for the screen display. Beyond this ABAP systems and external programs can communicate with one another through different protocols like RFC, TCP/IP, HTTP and OData. There is no such thing as crashing the whole engine in ABAP by a severe syntax error in your program. This architecture is robust and scalable.
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A WP is assigned to you only for the time of program processing and afterwards it is free for another user. A WP processes your program and owns a database connection so that you don’t need to take care of database handling (e.g. ABAP Dispatcher distributes the requests to the work processes (WP) within an AS ABAP. The ABAP programs and all the development tools run in the application layer. The application layer consists of one or more AS ABAP instances, a single Message Server, which is responsible for communication and load distribution within this layer, and a single Enqueue Server, which manages locks. The programs you develop are stored in the ABAP schema of the system.
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The database not only contains the user data, but also the entire program code of the ABAP Application Server and application programs, all administrative data etc. In fact, all three layers can actually run on a single computer. The Application Server ABAP (AS ABAP) consists of three layers: presentation, application, and database. The ABAP technology is continuously extended to serve new business scenarios and innovative application development in a first approach. It combines: the innovation potential of SAP’s in-memory database SAP HANA on the back end the proven reliability and robustness of the ABAP server and a digital user experience through SAP’s UI technology SAP Fiori. It is also a complete application development and runtime platform. SAP customers and partners also have a long tradition of building custom code and add-ons that run on the ABAP technology platform. ABAP technology is also available as a standalone platform for custom development of modern ABAP-based business applications.
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It is the underlying technology of SAP’s traditional Business Suite, SAP’s flagship solution SAP S/4HANA, and other forthcoming innovative solutions such as next-generation data warehouse SAP BW4/HANA. Its proven robustness, scalability and extensibility makes it the platform of choice for running mission-critical business processes. ABAP technology is the solid longtime foundation for SAP’s solution portfolio.