Simple rollback process

Question

when reviewing the exam, I came across this simple question asking about rollbacks in processes. I understand how rollbacks occur, but I need confirmation on my answer. Question:

my confusion stems from the fact that there is interprocess communication between the processes. does this change anything in terms of where the rollback is? my answer would be R13, R23, R32 and R43. any help is much appreciated! thank!

Answer 1

You need to go back to the point where the process can be sequentially restarted. Communication between processes means that you cannot restore one process after communication, and another - before this message.

P3 R32. , , .

Answer 2

: , , . , .

, , . , . , , . , .

, (i) - (iv) ( ).