Consider the following database schedule with two transactions, $T_1$ and $T_2$. $$S = r_2(X); r_1(X); r_2(Y); w_1(X); r_1(Y); w_2(X); a_1; a_2$$ where $r_i(Z)$ denotes a *read* operation by transaction $T_i$ on a variable $Z$, $w_i(Z)$ denotes a *write* operation by $T_i$ on a variable $Z$ and $a_i$ denotes an *abort* by transaction $T_i$. Which one of the following statements about the above schedule is **TRUE**?

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?

Topic-wise GATE CS PYQs with verified steps