Answer
Referencing links documents across collections using IDs. It is used when datasets are large, loosely connected, or when avoiding duplication.
Quick Answer
Data referencing stores the _id of a related document instead of embedding the data. Like a foreign key in SQL. Used when: data is large, shared across many documents, or independently accessed. Requires a separate query or $lookup to fetch the referenced data. Trade-off: two queries or slower $lookup vs embedded doc simplicity.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ