Free Access MongoDB.C100DBA.v2022-02-21.q41 Practice Test (Page 6)

Question 21

Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

A.db. posts.createIndex({^comments.author" :1});

B.db.posts.createIndex({^commerits.author";-!});

C.db.posts.createIndex({^comments.$.author":-l});

Question 22

Which of the following does MongoDB use to provide High Scalability?

A.Replication

B.Sharding

C.Indexing

D.Write Concern

Question 23

Which mongodb tool is used to report details on number of database operations in MongoDB?

A.mongorestore

B.mongotop

C.mongodump

D.mongostat

Question 24

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

A.executionStats

B.customExecutionStats

C.allPlansExecution

D.queryPlanner

Question 25

Which node in a replica set does accept write operation?

A.primary

B.arbiter

C.secondary

D.hidden

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