Below video explains some basic tips on production support. I have covered topics like, 1. Library list concept 2. Creating duplicate object in Qtemp 3. How to analyze MSGW job 4. WrkjobJS 5. How to check source of a object 6. DSPLOG 7. DDM a object with careful Watch this video more about DDM https://youtu.be/L5NT-kRhOEc