\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}