Free Access MongoDB.C100DBA.v2022-08-13.q44 Practice Test (Page 4)

Question 11

MongoDB is a schema-less design.

A.True

B.False

Question 12

Which command can be used to rebuild the indexes on a collection in MongoDB?

A.db.collection.reIndex({author:l})

B.db.collection.relndexQ

C.db.collection.createIndex({author:l}).reIndex()

D.db.collection.createlndex({relndex:l})

Question 13

The difference between $push and $addToSet is:

A.$addToSet needs the fields to be already present while $push will work even if the field is not present

B.$addToSet adds the item to the field only if the new item is of the same datatype

C.$addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not

D.There is no major difference between them. $addToSet is a deprecated version of $push.

Question 14

Consider the following documents:

You perform the following query;

How many documents will be updated by the query?

A.2

B.5

C.1

D.3

E.0

Question 15

Which of the following needs to be performed prior to initiate backup on a sharded cluster?

A.sh.stopBalancer( )

B.db.stopBalancer( )

C.db.stopServer( )

D.sh.stopServer( )

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