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Our business needs very robust, low latency, highly available and durable online transactional system which supports high concurrency for about four weeks in a year. It's almost like Thanksgiving sale where you mark down very popular item (think of iPhone ) by 100 % . We operate on state level ( K-12 ) online assessment market where entire state takes test in spring for few weeks. To operate in this market , you need to have a robust system which can absorb such a sudden spike in transaction volumes.