Posted On: Nov 23, 2022
In MongoDB, the structure of an ObjectId is consists of a 12-byte BSON type. This 12-byte structure can be distinguished as the first 4 bytes of the ObjectId representing the time in seconds since the UNIX epoch. Then the next 3 bytes of the ObjectId represent the machine identifier which is then followed by the next 2 bytes of the ObjectId represent the process ID.
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