Answer / Pretam

The covered query is an optimization technique in MongoDB that allows queries to reuse already fetched data, reducing the number of times collections need to be read from disk. It's particularly useful for queries with compound indexes where only a subset of the indexed fields are used in the query.nWhen a covered query is executed, the database checks if the required information can be found entirely within the index without needing to access the collection data. If possible, it returns only the requested data from the index instead of reading the entire document.

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