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- Documents - Database Manual - MongoDB Docs
The _id field is always the first field in a document If the server receives a document that does not have the _id field first, then it moves the field to the beginning of the document
- Difference between id and _id fields in MongoDB
«In MongoDB, each document stored in a collection requires a unique _id field that acts as a primary key If an inserted document omits the _id field, the MongoDB driver automatically generates an ObjectId for the _id field»
- What Is MongoDB’s _id Field and How to Use It - SolarWinds
The _id field is a 12-byte Field of BSON type made up of several 2-4 byte chains and is the unique identifier naming convention MongoDB uses across all its content
- How is id Generated in MongoDB - GeeksforGeeks
The _id field serves as the primary key for documents in a collection, ensuring each document has a unique identifier MongoDB guarantees that each _id value is unique within a collection
- MongoDB: How to set your own _id field value (with examples)
One of its core concepts is the _id field, a unique identifier for documents within a collection By default, MongoDB generates a unique ObjectId for each document, but it also allows users to set custom _id values
- _id, the Unsung Hero of MongoDB - Medium
MongoDB stands out for the flexibility and scalability of its document model And at its heart lies a seemingly simple field: _id Every document has one, it must be called _id, and it always
- 10 MongoDB _id Best Practices - CLIMB
The _id is the primary key for a MongoDB document, and it must be unique within a collection The value of the _id field must be unique across all documents in a collection, so using the same _id for two different documents in the same collection will result in an error
- All about MongoDBs _id Field - Navicat
By default the _id field is of type ObjectID, one of MongoDB's BSON types Users can also override _id to something other than an ObjectID, if desired ObjectIDs are 12 bytes long, composed of several 2-4 byte chains Each chain represents and designates a specific aspect of the document's identity
- MongoDB _id and its hidden features
The _id field is a unique identifier that is automatically generated by MongoDB for each document in a collection It is used to uniquely identify documents within a collection, and it is indexed by default to ensure fast queries and efficient performance
- Glossary - Database Manual - MongoDB Docs
You can think of the _id field as the document's primary key If you create a new document without an _id field, MongoDB automatically creates the field and assigns a unique BSON ObjectId to the field
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