MongoDB C100DBA Exam Questions - mytestengine Practice Lab

Question 1

What does the following aggregate query perform?

A

Fetches the posts with likes between 100 and 200 and sets their _id as null

B

Groups the posts by number of likes (101, 102, 103.) by adding 1 every time

C

Calculates the number of posts with likes between 100 and 200

D

Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time

Correct Answer: C

Explanation:

Answer: C

Question 2

Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

A

db.posts.find( { post_timestamp: { $fieldtype: null } } )

B

db.posts.find( { post_timestamp: { $type: null } } )

C

db.posts.find( { post_timestamp : { $type; 10 > > )

D

db.posts.find( { post_timestamp: { $fieldtype: 10 } } )

Correct Answer: C

Explanation:

Answer: C

Question 3

What is the first task that a secondary would perform on being prompted by another secondary for an election?

A

Start the election process for primary

B

Vote for the first secondary so that it would become the next primary

C

Vote for itself and then call for election

D

Connect to primary to confirm its availability

Correct Answer: D

Explanation:

Answer: D

Question 4

Aggregation Pipelines have a limit of:

A

No limit on document and 100 MB RAM

B

2 MB document and no limit on RAM

C

2 MB document and 100 MB RAM

D

16 MB document and 100 MB RAM

Correct Answer: D

Explanation:

Answer: D

Question 5

Which option should be used to update all the documents with the specified condition in the MongoDB query?

A

specify {all: true} as the third parameter of update command

B

updateAII instead of update

C

specify {updateAII: true} as the third parameter of update command

D

specify {multi : true} as the third parameter of update command

Correct Answer: D

Explanation:

Demo MongoDB C100DBA Exam Questions

What does the following aggregate query perform?

Fetches the posts with likes between 100 and 200 and sets their _id as null

Groups the posts by number of likes (101, 102, 103.) by adding 1 every time

Calculates the number of posts with likes between 100 and 200

Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time

Correct Answer: C

Answer: C

Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

db.posts.find( { post_timestamp: { $fieldtype: null } } )

db.posts.find( { post_timestamp: { $type: null } } )

db.posts.find( { post_timestamp : { $type; 10 > > )

db.posts.find( { post_timestamp: { $fieldtype: 10 } } )

Correct Answer: C

Answer: C

What is the first task that a secondary would perform on being prompted by another secondary for an election?

Start the election process for primary

Vote for the first secondary so that it would become the next primary

Vote for itself and then call for election

Connect to primary to confirm its availability

Correct Answer: D

Answer: D

Aggregation Pipelines have a limit of:

No limit on document and 100 MB RAM

2 MB document and no limit on RAM

2 MB document and 100 MB RAM

16 MB document and 100 MB RAM

Correct Answer: D

Answer: D

Which option should be used to update all the documents with the specified condition in the MongoDB query?

specify {all: true} as the third parameter of update command

updateAII instead of update

specify {updateAII: true} as the third parameter of update command

specify {multi : true} as the third parameter of update command

Correct Answer: D

Answer: D

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