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Can someone please explain me what a client in a SAP NetWeaver system using the ABAP stack is and how does it create logical separations within the same installation?
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Client/Server architecture divides the work of computing between “clients” and “servers.” Clients make requests of servers and process the results of those requests. For example, a client application might request data from a database server.
A client is a independent unit in the SAP system from an organizational point of view. Each client has it's own data environment. The client concept allows for the joint operation of several enterprises in one system that are independent of each other in business terms.
These three clients, CUST, QTST and PROD, are the central clients that exist in every system landscape. Standard system landscapes have precisely one client for each of these client roles.
One SAP system can be used for several independent companies (or subsidiaries of a company). The client is used to separate the data of these companies. Most database tables in an SAP system therefore have the client is a key. This is used e.g. for transactional data, master data and client dependent customizing data. Nevertheless there is also customizing that is valid across all clients (so called cross client customizing.)
In a nutshell: Client is a key field in most database tables to separate data of multiple companies using the same SAP system. Each company has its own client number.
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