SAP Basis

ADM100 Lesson: How the System Evaluates its Parameters
Figure 31: Assigning System Parameters
You can change these default values using the profile files, which are read
when an instance is started. These profile files are created during the
installation of the system and can also be edited later.
As the profile files are only read when the system is started, you must
restart the instance or the entire system after changing parameters.
Dynamic switching; that is, while the system is running, is only possible
for a small number of system parameters.
Figure 32: Profile Files at Operating System Level
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