Go to the Application Engine's Process Definition under the menu item PeopleTools, Process Scheduler.
1. Click on the override tab
2. On the Parameter list line select Append from the dropdown
3. In the edit box next to it, you can use any of the combination of trace settings listed below:
-TRACE 7 -TOOLSTRACEPC 3596 -TOOLSTRACESQL 31
Once you enter your trace settings in the parameter list, save the App Engine Process Defnition. Now, this program will be traced every time it is run, until these trace settings are removed.