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Data is structured and needs to be consistent, but your query pattern doesn’t match with a standard relational DB’s. You need your transactions to be isolated, and atomic and all things ACID… But OMG it needs to scale infinitely like Cassandra!! So how would you decide what storage solution to choose? We could be looking for the following storage solutions: Redis or Memcached. Data Warehouses are used more for offline reporting that usually transactions. This is where we end up using data warehouse solutions like Hadoop.
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