In the example for illustrating cascading roll back, how come the condition for simple 2P lock is satisfying when in T1 - after X-L(A) there is U(A) and in T2 again there is XL(A). As once the unlocking starts no more locking can be allowed in a schedule. i am confused in this. Can anyone please help me to get this correctly??
also can you plz give me a example of successful basic 2 phase locking protocol.