When I set exchange partition ( auto dop is open), I notice multiblock reading in session events and exchange partition process takes too much time.. But if I set manual dop, job is completed earlier. i tried Parallel_min_threshold=0 and 1 as a result of this i couldnt solve problem.
Other paramters: _parallel_cache_policy=Adaptive
_serial_direct_read=AUTO
In addition: query and etl jobs works properly..(Cell smart table scan) there was only one problem about exchange partition.
Whould you please give your suggestion on this problem.
Solutions and direction
I changed _serial_direct_read as ALWAYS then problem is solved