Grokking MongoDB
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What is ObjectId in MongoDB?
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In MongoDB, every document stored in a collection requires a unique identifier. This identifier is known as the _id field. If you do not explicitly specify an _id field when inserting a document, MongoDB will automatically generate one for you. The default type for this automatically generated _id is ObjectId.

Understanding ObjectId is crucial as it plays a significant role in ensuring the uniqueness and efficiency of document retrieval in MongoDB.

What is ObjectId?

ObjectId is a 12-byte identifier typically used for the _id field in MongoDB documents

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