Question 1

You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

Options :

A : A document will be inserted with the same _id as the last document inserted

B : A document that matches the collection-s existing schema, but with null fields

C : A document with an _id assigned to be an Objectld

D : An empty document

E : No document will be inserted; an error will be raised

Answer: C

Question 2

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

Options :

A : mongostat

B : mongotop

C : mongorestore

D : mongodump

Answer: A

Question 3

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

Options :

A : upsert command instead of update command

B : This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query

C : {update: true, insert: true} as the third parameter of update command

D : Specify {upsert : true } as the third parameter of update command

Answer: D

Question 4

Which mongodb tools allow us to work with our data in a human readable format?

Options :

A : mongodump

B : mongostat

C : mongoimport

D : mongoexport

Answer: C,D

Question 5

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

Options :

A : Sharding

B : Properly defined user roles

C : Replication

D : Put indexes on all of your documents

E : The proper storage engine

Answer: C

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