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A prefix of a _______ index is a subset that consists of one or more keys at the start of the index key pattern.

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A prefix of a _______ index is a subset that consists of one or more keys at the start of the index key pattern.

(a) unique

(b) primary

(c) compound

(d) none of the mentioned

I have been asked this question in unit test.

Enquiry is from Indexing Strategies in portion Index/Indexing Concepts of MongoDB

1 Answer

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Best answer
Right choice is (b) primary

The explanation is: If the sort keys correspond to the index keys or an index prefix, MongoDB can use the index to sort the query results.

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