MongoDB is implemented using a minimum of 3 node clusters. As opposed to Elasticsearch and Cassandra, MongoDB clusters have one master/primary node with secondary nodes. All writes are being done to one node and distributed between several nodes and data is replicated to all nodes using replica sets.
MongoDB can be also used as a shared file system using its GridFS feature.
MongoDB has a free community licence without support and MongoDB enterprise features.
Application types: Social networks, session management, high-end OLTP system, shared file system
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