Adaption of Parameters
Depending on your chosen preconfiguration mode, you can adapt further parameters to tailor the update to your specific needs.
There are several parameters with which you can influence the use of SAP system resources for the update procedure during uptime and downtime, such as the number of background processes used by tp during uptime and downtime.
Background Process and Tool Parameters
The preconfiguration modes make sure that these numbers fit to the upgrade strategy and database archiving strategy used.
Shadow Instance Parameters
There are several parameters used for running the shadow instance. Most of these parameters are set automatically, for example, an instance number not yet used in your system landscape.
SGEN Execution Mode
With transaction SGEN, you can generate ABAP loads in your SAP system. Depending on the preconfiguration mode, you can choose an execution strategy for the ABAP load generation: The system starts SGEN either during the uptime only, or during the uptime and after the downtime.
Memory-Optimized Activation
On 32 bit systems, the activation of ABAP Dictionary objects runs in a memory-optimized mode regardless of the chosen preconfiguration mode. Compared to the activation on 64 bit systems, the activation consumes less memory, but the runtime lasts longer.
In the following, you can find a description of the parameters and their influence on the runtime of the update: