\begin{tikzpicture}[font=\large]
 		 \begin{semilogyaxis}[
 		   %width = 30cm,
 		   %height = 15cm,
 		   %ymax = 100000,
               width = 12cm,
               height = 8cm,
    			ybar,
    			%ymin = 1,
    			%ymax = 5000000000,
%    ytick = {1,10,100,1000,10000,100000,1000000,10000000},
   			ymajorgrids = true,
   			ylabel = {Query Response Time (in ms)},
                %xlabel = {Queries},
    			symbolic x coords = {$Q_0$,$Q_1$,$Q_2$,$Q_3$,$Q_4$,$Q_5$},
    			  %bar width=5pt,
    			  %enlarge x limits=0.02,
    			scaled y ticks = true,
			legend pos= north west,
 legend cell align=left
   		]
   \addplot coordinates {($Q_0$, 40) ($Q_1$, 25) ($Q_2$, 25) ($Q_3$, 131) ($Q_4$, 616) ($Q_5$, 27)};

   \addplot coordinates {($Q_0$, 1070) ($Q_1$, 245) ($Q_2$, 164) ($Q_3$, 53887) ($Q_4$, 5577) ($Q_5$, 469)};
   
   \addplot coordinates {($Q_0$, 50) ($Q_1$, 217) ($Q_2$, 210) ($Q_3$, 23797) ($Q_4$, 5536) ($Q_5$, 2736)};
		
   		 \legend{gStore,Jena, Virtuoso}
  		\end{semilogyaxis}
\end{tikzpicture}