Deleting the WBS with Activities

Hello All,

I would like to delete more than 50,000 Activites with associated wbs. Its time consuming process if we try to delete it in front end level.

So i want to try it in backend table level. will it be advisable in production instance.

I'm suspecting if we try in back end it may delete the associated codes, calenders etc..

if any one deleted the bulk of activities in back end table level pls provide you approach.

Thanks,

Sathish