Why was Cassandra created?

Understanding how Apache Cassandra works under the hood can greatly improve your chances of running a successful cluster or application. We will reach that understanding by asking some simple, fundamental questions. What types of problems was Cassandra designed to solve? Why does a relational database management system (RDBMS) have difficulty handling those problems? If Cassandra works this way, how should I design my data model to achieve the best performance?

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