C100DEV Exam Dumps | You have the following index in a movies collection: { "title": 1, "imdb.rating": -1, "imdb.votes": -1,

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MongoDB.C100DEV.v2023-03-11.q87
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Question 2/87

You have the following index in a movies collection: { "title": 1, "imdb.rating": -1, "imdb.votes": -1, "type": 1 } Can the following query use the given index for both filtering and sorting?
db.movies.find( { "title": { "$lt": "M" } } ).sort( { "imdb.votes": -1 } )

A. Yes

B. No

Correct Answer: B

No, this query does not use equality in the index prefix. When you use an index to filter and sort, the query must contain equality conditions on all prefix keys that precede the sort keys. Also, it skipped the next key in the "imdb.rating" prefix in the sort predicate. https://docs.mongodb.com/manual/indexes/

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