Question

What are faulted entities and what the difference between them and ‘usual’ entities? where can I read about that?

Thanks

Answer 1

ADC has some documentation on this topic:

Faulting reduces the amount of memory your application consumes. A fault is a placeholder object that represents a managed object that has not yet been fully realized, or a collection object that represents a relationship:

All objects are loaded on demand to reduce memory usage.
override -(void) awakeFromFetch/Insert and -(void) willTurnIntoFault to do custom initialization

ADC on Faulting and Uniquing