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\begin{frame}
  \frametitle{Databases}
  
  \begin{block}{}
    A \emph{database (DB)} is a collection of data with
    \begin{itemize}
%       \item a certain goal
      \item a certain logical structure
      \item a specific semantics
      \item a specific group of users
%       \item describing only certain aspects of the real world (universe of disclosure)
    \end{itemize}
  \end{block}
  \bigskip
  \pause
  
  \begin{block}{}
    A \emph{database management system (DBMS)} allows to 
    \begin{itemize}
    \pause
      \item create, modify and manipulate a database
    \pause
      \item query (retrieve) the data using a query language
    \pause
      \item support persistent storage of large amounts of data
    \pause
      \item enable durability and recovery from failure
    \pause
      \item control access to the data by many users in parallel
        \begin{itemize}
          \item without unexpected interactions among users (\emph{isolation})
          \item actions on the data should never be partial (\emph{atomicity})
        \end{itemize} 
    \end{itemize}
  \end{block}
  
\end{frame}