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MongoDB C100DBA - Questions & Answers

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Question 1
Multiple choice

Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.

A.

Multi-statement transactions

B.

Joins

C.

Authentication

Question 2
Single choice

The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

A.

$project

B.

$aggregate

C.

$match

D.

$group

Question 3
Single choice

In a collection that contains 100 post documents, what does the following command do? db. posts. find ().skip(5).limit(5)

A.

Skip and limit nullify each other. Hence returning the first five documents.

B.

Skips the first five documents and returns the next five

C.

Limits the first five documents and then return them in reverse order

D.

Skips the first five documents and returns the sixth document five times

Question 4
Fill in the blank

FILL BLANK

What tool do you use to see if you have a problem in the consumption of disk I / 0?

Question 5
Single choice

Which of the following is supported by MongoDB?

A.

Transaction Management

B.

ACID Transactions

C.

Journaling

D.

Relationships between Collections (Primary Key Foreign Key)

Question 6
Single choice

The MongoDB explain() method does not support which of the following verbosity mode:

A.

executionStats

B.

queryPlanner

C.

customExecutionStats

D.

allPlansExecution

Question 7
Single choice

Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc.

Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

A.

db.posts.finOne({},{_id:0, post_text:1})

B.

db.posts.findOne({post_text: 1})

C.

db.posts.find({},{_id:Of post_text:1})

D.

db.posts.finOne,{post_text:l})

Question 8
Single choice

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal.

What should be the value of j?

A.

1

B.

2

C.

0

D.

7

Question 9
Single choice

Aggregation Pipelines have a limit of:

A.

2 MB document and 100 MB RAM

B.

16 MB document and 100 MB RAM

C.

No limit on document and 100 MB RAM

D.

2 MB document and no limit on RAM

Question 10
Single choice

What is the maximum size of a MongoDB document?

A.

2 MB

B.

12 MB

C.

There is no maximum size. It depends on the RAM.

D.

16 MB

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