Are you considering Cassandra or MongoDB as the data store for your next project?  Would you like to compare the two databases?  Cassandra and MongoDB are both “NoSQL” databases, but the reality is that they are very different . They have very different strengths and value propositions – so any comparison has to be a nuanced one. Let’s start with initial requirements… Neither of these databases replace RDBMS, nor are they “ACID” databases. So If you have a transactional workload where normalization and consistency are the primary requirements, neither of these databases will work for you. You are better off sticking with traditional relational databases like MySQL, PostGres, Oracle etc. Now that we have relational databases out of the way, let’s consider the major differences between Cassandra and MongoDB that will help you make the decision. In this post, I am not going to discuss specific features but will point out some high-level strategic differences to help you make your choice.

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https://scalegrid.io/blog/cassandra-vs-mongodb/