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\makeatletter
\tikzset{
database/.style={
path picture={
\draw (0, 1.5*\database@segmentheight) circle [x radius=\database@radius,y radius=\database@aspectratio*\database@radius];
\draw (-\database@radius, 0.5*\database@segmentheight) arc [start angle=180,end angle=360,x radius=\database@radius, y radius=\database@aspectratio*\database@radius];
\draw (-\database@radius,-0.5*\database@segmentheight) arc [start angle=180,end angle=360,x radius=\database@radius, y radius=\database@aspectratio*\database@radius];
\draw (-\database@radius,1.5*\database@segmentheight) -- ++(0,-3*\database@segmentheight) arc [start angle=180,end angle=360,x radius=\database@radius, y radius=\database@aspectratio*\database@radius] -- ++(0,3*\database@segmentheight);
},
minimum width=2*\database@radius + \pgflinewidth,
minimum height=3*\database@segmentheight + 2*\database@aspectratio*\database@radius + \pgflinewidth,
},
database segment height/.store in=\database@segmentheight,
database radius/.store in=\database@radius,
database aspect ratio/.store in=\database@aspectratio,
database segment height=0.1cm,
database radius=0.25cm,
database aspect ratio=0.35,
}
\makeatother
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