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You may not specify a unique constraint on a ______ index.

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+1 vote
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in MongoDB by (131k points)
You may not specify a unique constraint on a ______ index.

(a) Hashed

(b) Unique

(c) Sparse

(d) Compound

I have been asked this question by my college director while I was bunking the class.

The origin of the question is Index Properties topic in portion Index/Indexing Concepts of MongoDB

1 Answer

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The correct option is (a) Hashed

The explanation is: Because of the unique constraint, MongoDB will only permit one document that lacks the indexed field.

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