Q51

Consider the following database schedule with two transactions $T_{1}$ and $T_{2}$. $S= r_{2}\left(X\right); r_{1}\left(X\right); r_{2} \left(Y\right); w_{1} \left(X\right); r_{1} \left(Y\right); w_{2} \left(X\right); a_{1}; a_{2}$ 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?