What does the developer trace level rdisp/TRACE control, and why keep it low on a live system?

What four trace types does ST05 offer, and how can they be combined?

In current SAP systems, which transaction combines the SQL trace and ABAP runtime trace for analyzing one transaction?

Which developer traces does each SAP process write, and where?

What is exclusive debugging mode, and why is nonexclusive mode blocked in production?

What are the ABAP debugger flow-control keys, and which system fields are shown?

Why should runtime analysis and performance trace be avoided in production, and how do you limit their impact if needed?