Documents and collections, BSON, CRUD operators, aggregation pipeline, indexes, replica sets and sharding.
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- What is a document in MongoDB?
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A record or JSON-like object that stores data.- What is a collection in MongoDB?
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A group or set of documents stored together.- What field uniquely identifies every MongoDB document?
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The _id field.- What is the default data format for MongoDB documents?
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BSON (Binary JSON).- Can a MongoDB document contain nested documents?
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Yes, documents can contain other documents as values.- What is the maximum size of a single MongoDB document?
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16 megabytes.- What is BSON in MongoDB?
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A binary-encoded serialization format for JSON-like documents.- Name three data types supported by BSON.
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Date, ObjectId, Binary (other examples: Int32, Int64, Double, String, Array, Document, Boolean, Null).- What key advantage does BSON have over JSON?
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BSON supports more data types and is more efficient for storage and transmission.- Does BSON support array data types?
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Yes, BSON has native support for arrays.- What does CRUD stand for?
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Create, Read, Update, Delete.- What MongoDB method creates a new document?
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insertOne or insertMany.- What MongoDB method retrieves documents from a collection?
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find or findOne.- What MongoDB methods modify existing documents?
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updateOne, updateMany, or replaceOne.- What MongoDB methods remove documents from a collection?
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deleteOne or deleteMany.
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