Hi,
I wanna ask a question. Did abap team create the index while user were using tables/t-codes..? If yes, I think lots of users call you for performans problems.
First suggest, you have performans problem after creating index, index is wrong or wrong order. Also you have to check sql s while executing on table, you can check index usage.If all sql usage new index you can say to abap team for correct to abap code.
Second suggest, you can use parallelism for sequential read for mseg.
Third suggest, you an use parallelism for the index.
And last you can reorg table (MSEG) or collect new statistic for MSEG from DB20.
Regards,
O.K.