In the database world, it is frequently important to have unique identifiers associated with a record. In a legacy, tabular database, these unique identifiers are often used as primary keys.
In the database world, it is frequently important to have unique identifiers associated with a record. In a legacy, tabular database, these unique identifiers are often used as primary keys. In a modern database, such as MongoDB, we need a unique identifier in an
_id field as a primary key as well. MongoDB provides an automatic unique identifier for the
_id field in the form of an
ObjectId data type.
For those that are familiar with MongoDB Documents you've likely come across the
ObjectId data type in the
_id field. For those unfamiliar with MongoDB Documents, the ObjectId datatype is automatically generated as a unique document identifier if no other identifier is provided. But what is an
ObjectId field? What makes them unique? This post will unveil some of the magic behind the BSON ObjectId data type. First, though, what is BSON?
Let's start with an examination of what goes into an ObjectId. If we take a look at the construction of the ObjectId value, in its current implementation, it is a 12-byte hexadecimal value.
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DISCLAIMER: absolutely subjective point of view, for the official definition check out vocabularies or Wikipedia. And come on, you wouldn’t read an entire article just to get the definition.
Suppose you are looking to book a flight ticket for a trip of yours. Now, you will not go directly to a specific site and book the first ticket that you see.