The Concept of a SAP Instance
An instance is an administrative entity that groups together Web AS components that offer one or several services. These offered services are started or stopped together. All instance components are configured using a common instance profile. For more information on SAP profiles, please refer to the section entitled “Profiles” in Chapter 4.
A centralized SAP Web AS system would be made of a unique instance. Another feature that distinguishes the instances is that every SAP instance has its own buffer area, which means that it allocated its own main memory space.
SAP distinguishes between central instances and dialog instances. Every SAP system has just one central host, which contains all basic services such as ...
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