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What Is MongoDB? The Document Model, BSON, Collections and How It Differs from the Relational World

MongoDB is a document database that stores data as BSON documents with typed fields instead of table rows; data read together lives in one document, so most screens need a single read, but the model must come from the queries, not from the tables. With real output: the string date trap, BSON bytes, Decimal128, how an ObjectId is built, a concept map, WiredTiger, licensing and when not to choose it.