SAP Instance
An instance is an administrative entity that groups
together R/3 components which offer one or several services. These offered services
are started or stopped together. All instance components are configured using a
common instance profile.
In sap there are two types of instance central instances
and dialog instances SAP distinguishes between central instances and
dialog instances. Every SAP system has just one central instance, which contains
all basic services such as the message server, gateway, update, enqueue, dialog,
spool, and background right from installation. Dialog instances, as defined, only
contain a set of basic services such as dialog and background work processes from
the time of installation.
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