|Que.||Consider the following database schedule with two transactions, T1 and T2.
S = r2(X); r1(X); r2(Y); w1(X); r1(Y); w2(X); a1; a2;
where ri(Z) denotes a read operation by transaction Ti on a variable Z, wi(Z) denotes a write operation by Ti on a variable Z and ai denotes an abort by transaction Ti . Which one of the following statements about the above schedule is TRUE?
|a.||S is non-recoverable|
|b.||S is recoverable, but has a cascading abort|
|c.||S does not have a cascading abort|
|d.||S is strict|
|Answer:S does not have a cascading abort|