Question 1

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 2

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; '$author', x: { $sum: $likes } } } ] )

Options :

A : Average of likes on all the posts of an author, grouped by author

B : Number of posts by an author

C : Sum of likes on all the posts by all the authors

D : Sum of likes on all the posts by an author, grouped by author

Answer: D

Question 3

'mongoimport' command is used for

Options :

A : Batch data insertion

B : None of the above

C : Multiple command import

D : Multiple command insertion

Answer: A

Question 4

Which of the following collections stores authentication credentials in MongoDB?

Options :

A : test.users

B : local.users

C : system.users

D : users.users

Answer: C

Question 5

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

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