Free Access MongoDB.C100DBA.v2022-08-13.q44 Practice Test (Page 5)

Question 16

As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

A.MongoDB does not do any movements by default and will use the order provided

B.Providing these parameters in any order does not impact the performance

C.$match moves before $sort

D.$sort moves before $match

Question 17

'$set' sets the value of

A.Code block

B.Name/value pair

C.None of the above

D.Key

Question 18

Which operations add new documents to a collection?

A.insert

B.Create

C.update

D.delete

Question 19

Which of the following node is used during election in a replication cluster?

A.hidden

B.arbiter

C.primary

D.secondary

Question 20

Which is the default mode in which the explain() command runs?

A.queryPlanner

B.executionStats

C.allPlansExecution

D.customExecutionStats

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