This is article is referring to 2475935 – ABAP upgrade : How to skip phase RUN_SGEN_GENER8 on shadow instance. Do always use SAP Note for the latest and updated information on SAP issues and resolution.
So, you want to abort / skip the RUN_SGEN_GENER8 phase because the process is taking too long time during the SUM preprocessing step.
Login to the shadow system with DDIC user. Use transaction code SE38 and launch the report RSUPG_SGEN_ABORT_SHADOW.
Check the “I want to abort shadow SGEN” and click on execute.
The shadow SGEN aborted. Wait and monitor the SGEN process and it shall be completed in the next few minutes.
Alternatively, if above steps does not working, please use below command and execute directly on your database.
truncate table [SCHEMA].UPGGENSET~;
Once the SUM phases are completed (your upgrade procedure complete), you need to manually run the SGEN in the main instance.
