Consider the following schedules involving two transactions.
$S_1 : r_1(X) ; r_1(Y); r_2(X); r_2(Y); w_2(Y); w_1(X)$
$S_2 : r_1(X) ; r_2(X); r_2(Y); w_2(Y); r_1(Y); w_1(X)$
Which one of the following statements is correct with respect to above?
- Both $S_1$ and $S_2$ are conflict serializable
- Both $S_1$ and $S_2$ are not conflict serializable
- $S_1$ is conflict serializable and $S_2$ is not conflict serializable
- $S_1$ is not conflict serializable and $S_2$ is conflict serializable