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\begin{frame}
  \frametitle{Databases}


  Why not just store data in files?
  \begin{itemize}
    \pause
    \item no query language
    \pause
    \item logical structure limited to directories
    \pause
    \item no efficient access
      \begin{itemize}
        \item searching through a large file can take hours
      \end{itemize}
    \pause
    \item no or limited protection from data loss
    \pause
    \item no access control for parallel manipulation of data
  \end{itemize}
\end{frame}