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C100DBA

Practice MongoDB C100DBA Exam Questions

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  Total 132 Questions
Question No 1

What does the following aggregate query perform?

Choose the Choices:

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

C
Question No 2

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

Choose the Choices:

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 } } )

C
Question No 3

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

Choose the Choices:

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 Answer: D
Question No 4

Aggregation Pipelines have a limit of:

Choose the Choices:

No limit on document and 100 MB RAM B.2 MB document and no limit on RAM

2 MB document and 100 MB RAM

16 MB document and 100 MB RAM

D
Question No 5

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

Choose the Choices:

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

D
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