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\begin{frame}
  \frametitle{Serializable Schedules}
  
  \begin{goal}{}
    A schedule is \emph{serial} if the actions of the different transactions are not interleaved;
    they are executed one after another.
  \end{goal}
  \pause
  
  \begin{goal}{}
    A schedule is \emph{serializable} if its effect on the database 
    is the same as that of some serial schedule.
  \end{goal}
  \remark{%
    We assume that there are no effects other than the effects to the datbase,
    i.e. no writing to the screen.
  }
  \pause
  \bigskip
  
  \begin{quiz}{\textwidth}{Quiz Serializable Schedules}
    We usually only want to allow serializable schedules. Why?
  \end{quiz}
\end{frame}