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The ______ property of an index ensures that the index only contain entries for documents that have the indexed field.

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The ______ property of an index ensures that the index only contain entries for documents that have the indexed field.

(a) Hashed

(b) Unique

(c) Sparse

(d) None of the mentioned

I had been asked this question during an online exam.

My question is from Index Types in chapter Index/Indexing Concepts of MongoDB

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The correct answer is (c) Sparse

For explanation: The index skips documents that do not have the indexed field.

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