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QUESTION: 56

You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest. Which comparison order is used?

MinKey, Null, Numbers,Symbol, String,Object,Array,BinData
MinKey, Null, Numbers,Object,Array,BinData,Symbol, String
Object/Array^inData/Symbol,MinKey, Null, Numbers,String
Objec^Array^inData,Symbol, String,MinKey, Null, Numbers

Answer(s): A

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Below is a sample document in a given collection test.

{ a : 5, b : 3, c: 2, d : 1 >

Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in- memory sorting? Select all valid.

db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )

Answer(s): A,D

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QUESTION: 58

Which of the following is incorrect statement about find and findOne operations in MongoDB?

findQ returns all the documents in a collection while findOne() retrieves only the first one.
find.limit(l) is not the same query as findOne()
findOneQ returns the actual first document retrieved from a collection
findQ and findOneQ returns cursors to the collection documents

Answer(s): D

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