C100DEV Practice Online

Question 1

What is the built-in database called config in MongoDB for?

A :

The config database stores data describing the MongoDB server. For replica sets, it also stores information about the replication process.

B : The config database plays an important role in the authentication and authorization process. Certain actions performed by administrators also require access to this database.

C : The config database is used to store information about shards in shared MongoDB cluster.

Answer: C

Question 2

Which cursor method should you use to get information about the query plan?

A : cursor.explain()

B : cursor.size()

C : cursor.map()

D : cursor.hint()

Answer: A

Question 3

To ensure high availability in the event of a server failure, which of the following MongoDB features should you use?

A : Properly defined indexes.

B : Proper storage engine.

C : Sharding.

D : Properly defined views.

E : Replication.

Answer: A

Question 4

You are working in a team on a certain application in the gaming sector. Queries similar to the following are quite often executed by your application.

db.gamers.find( { level: 10, is_active: true } )

How can you speed up the execution of similar queries? Choose the best option.

A : There is no way to speed up this query.

B :

Create the given index:

db.gamers.createIndex( { level: 1 } )

C :

Create the given index:

db.gamers.createIndex( { is_active: 1 } )

D :

Create the given index:

db.gamers.createIndex( { level: 1, is_active: 1 } )

Answer: D

Question 5

Suppose you have a movies collection with the following document structure:

{

_id: ObjectId("573a1390f29313caabcd60e4"),

title: 'The Immigrant',

fullplot: "Charlie is on his way to the USA. He wins in a card game, puts the money in Edna's bag (she and her sick mother have been robbed of everything). When he retrieves a little for himself he is accused of being a thief. Edna clears his name. Later, broke, Charlie finds a coin and goes into a restaurant."

}

You want to perform text search queries on fullplot field. What do you have to do?

A :

Just query the database. For example:

db.movies.find( { $text: { $search: 'spaceship'} } ).explain()

B : You cannot perform a text search in MongoDB.

C :

First, create an index:

db.movies.createIndex( { fullplot: 1 } )

Then query the database:

db.movies.find( { $text: { $search: 'spaceship' } } )

D :

First, create a text index:

db.movies.createIndex( { fullplot: 'text' } )

Then query the database:

db.movies.find( { $text: { $search: 'spaceship' } } )

Answer: D

Name:	MongoDB Certified Developer Associate
Exam Code:	C100DEV
Certification:	MongoDB Certified Developer Associate
Vendor:	MongoDB
Total Questions:	279
Last Updated:	May 06, 2024

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