Vistex Associate Developer interview questions

my technical interview was 40-45 minutes long and a bit difficult, a chubby guy taking interview never smiled or express himself when i was giving answers to his questions and every answer i was giving, he was making faces like i was wrong, which screwed my confidence. He asked to draw database and excepting me to be an expert in create optimized database.He asked me to draw database and excepting me to be an expert in creating optimized database.