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MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.

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MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.

(a) Single

(b) Non Unique

(c) Compound

(d) None of the mentioned

This question was posed to me during an interview.

This intriguing question comes from Indexes In MongoDB topic in section Index/Indexing Concepts of MongoDB

1 Answer

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Best answer
Correct option is (a) Single

To explain I would say: If applications do not specify a value for _id the driver or the mongod will create an _id field with an ObjectId value.

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