\begin{frame} \frametitle{WR Conflicts} \begin{goal}{} There is a \emph{WR conflict} between $T_1$ and $T_2$ if there is an item Y: \begin{itemize} \item $T_1$ writes Y and afterwards, $T_2$ reads Y \end{itemize} \end{goal} If $T_1$ has not committed this is a \emph{dirty read}. \bigskip \pause \begin{quiz}{\textwidth}{Find all WR conflicts in the following schedule} \begin{tcenter} \begin{tikzpicture} \schedule{}{3}{2rV|3wV|1wY!1+1|2rY!1+1|2wZ} \end{tikzpicture} \end{tcenter} \end{quiz} \end{frame}