Hi,
My issue was due to DB mirroring setup. In our DB mirror setup, whenever a commit happens the data will firstly be written at the DR site then writes at the Primary Database instance. (This method of setup was to avoid data loss during a System/DBcrash). the same principles works when the SUM tool runs in to "pre-Processing". The data will be writen in the DR site first before the Primary DB instance (note: we switch the DB mode to simple only at the 'Execution' stage). This was the reason why it took so long time for each package to import during shadow phase. So we had to break the mirror setup before the Pre-processsing. Then we could see an improvement in the performance
If you have completed the Upgrade in QTY, you can compare the duration of each package import between QTY and PRD. That will help you understand how much more time PRD takes during the Pre-processing. There was a huge difference in our case between these systems and the only difference we had between QTY and PRD was DB mirror setup
EX log:
4 ETW000 SAPKW74003 touched.
4 ETW690 COMMIT "128" "769438150"
4 ETW000
24536164 bytes read.
4 ETW000 Transport overhead 0.0 %.
4 ETW000 Duration: 3:02 min (134814 bytes/sec).
3 ETW710 "1" "0"
THe below notes may be helpful to you
note #965908
1616401 - Understanding parallelism during the Upgrades, EhPs and
Support Packages implementations
1945399 - performance analysis for SHADOW_IMPORT_INC
and TABIM_UPG phase
Thanks,
ASK