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\begin{frame}
  \frametitle{Motivation for Database Management Systems}
  
  \begin{goal}{Motivation for database management systems}
    \begin{itemize}
    \pause
      \item \emph{data independence}
      \begin{itemize}
        \item logical view on the data independent of physical storage
        \item user interacts with a simple view on the data
        \item behind the scenes (invisible for the user) are
        complex storage structures that allow rapid access and manipulation
      \end{itemize}
    \pause
      \item \emph{avoidance of duplication}
        \begin{itemize}
          \item different views on the same database
            \begin{itemize}
              \item for different users or different applications
              \item hiding parts of the data for privacy or security
            \end{itemize}
        \end{itemize}
    \pause
      \item high-level \emph{declarative query languages}
      \begin{itemize}
        \item query tells what you want, independent of storage structure 
        \item efficient data access (automatic query optimisation)
      \end{itemize}
    \end{itemize}
    
  \end{goal}
\end{frame}