In order to avert a disaster in PeopleSoft or to enable investigative analysis in PeopleSoft after a disaster, you need to enable change control locking in PeopleSoft.
To Enable Change Control Locking in PeopleSoft:
Login into the database using application designer
Navigate to Tools > Change Control > Administration
Check the Change control Locking to activate the locking of objects
Once you have change control locking enabled, you would be able to apply locks on the objects and also to have a detailed entry at the DB level regarding the modification made by a particular user.