MongoDB ObjectId Data Type – Guidelines
Today in this article, we will see more details about MongoDB ObjectId Data type.
ObjectId is the 12-byte element consisting of a timestamp value, a random value, and an incremental counter.
Today in this article, we will cover below aspects,
MongoDB _id field as ObjectId
MongoDB uses the _id field as ObjectId this Id has few behavioral characteristics and it is explained below, A 4-byte timestamp is a UNIX timestamp.
- MongoDB database automatically generates _id the field for insertion.
- This field is unique for every document inserted into the collection.
- _id field is automatically indexed and the index is unique.
It represents the ObjectId’s creation, measured in seconds since the Unix epoch. for more details, please visit here.
MongoDB ObjectId fields details
ObjectId is the 12-byte element consisting of a timestamp value, a random value, and an incremental counter.
- A 4-byte timestamp is a UNIX timestamp. It represents the ObjectId’s creation timestamp, measured in seconds since the Unix epoch.
If interested to know how to get timestamp using these 4 bytes, please visit the below article,
- A 5-byte random value is generated once per process. This random value is unique to the machine and process.
- A 3-byte incrementing counter, initialized to a random value.
References:
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