Hi
One way would be to launch the deletion using a (very) low parallelism.
=> SCC5 /goto/parallel processes.
But the deletion is gonna be very long.
You could also exclude the most heavily used application table from the deletion (using expert settings) and schedule their deletion during a low activity period (over a weekend for instance). Check also the information provided in note 365304 - CC-ADMIN: Reports for deleting tables
Regards