Data in MongoDB is actually stored in the form of documents. The document is a collection of key-value pairs. The key is also known as an attribute.
Documents have a dynamic schema and documents in the same collection may vary in field set.
Here is the structure of a MongoDB document:
MongoDB documents have a special field called _id._id is a 12-byte hexadecimal number that ensures the uniqueness of the document. It is generated by MongoDB if not provided by the developer.
Of these 12 bytes, the first 4 bytes represent the current time stamp, the next 3 bytes represent the machine ID, the next 2 bytes represent the process ...
