Nosql Exam Questions With Verified And
Updated Answers
1. What is the purpose of the MongoDB aggregation framework?
To group and summarize data from multiple documents
To store data in a flat file
To process data in real-time
To convert data into a graph - answer✔To group and summarize data from multiple documents
2. What is the maximum size limit for a single aggregation pipeline in MongoDB?
16MB
32MB
64MB
128MB
верно - answer✔32MB
3. Which stage in MongoDB aggregation framework allows you to rearrange documents based
on a specified expression?
$sort
$match
$group
$project
верно - answer✔$sort
4. What is the purpose of the $match stage in MongoDB aggregation framework?
To filter documents based on a specified condition
ALL RIGHTS RESERVED.
To summarize data from multiple documents
To group data based on a specified expression
To rearrange documents based on a specified expression
верно - answer✔To filter documents based on a specified condition
5. What is the purpose of the $group stage in MongoDB aggregation framework?
To filter documents based on a specified condition
To summarize data from multiple documents
To group data based on a specified expression
To rearrange documents based on a specified expression
верно - answer✔To group data based on a specified expression
6. What is the purpose of the $project stage in MongoDB aggregation framework?
To filter documents based on a specified condition
To summarize data from multiple documents
To group data based on a specified expression
To reshape documents by adding, removing, or modifying fields
верно - answer✔To reshape documents by adding, removing, or modifying fields
7. Which stage in MongoDB aggregation framework allows you to limit the number of
documents returned from the pipeline?
$sort
$match
$group
$limit
верно - answer✔limit
8. Which stage in MongoDB aggregation framework allows you to skip a specified number of
documents before starting to return documents?
$sort
$match
верно - answer✔skip
9. What is the purpose of the $lookup stage in MongoDB aggregation framework?
To join data from multiple collections
To group and summarize data from multiple documents
To store data in a flat file
To convert data into a graph
верно - answer✔To join data from multiple collections
10. What is the purpose of the $unwind stage in MongoDB aggregation framework?
To join data from multiple collections
To decompose an array into separate documents
To store data in a flat file
To convert data into a graph
верно - answer✔To decompose an array into separate documents
Which of the following is/are true of the $match stage?
$match can use both query operators and aggregation expressions.
$match can only filter documents on one field.
It uses the familiar MongoDB query language.
It should come very early in an aggregation pipeline. - answer✔It uses the familiar MongoDB
query language.
It should come very early in an aggregation pipeline.
Which of the following statements are true of the $project stage?
Once we specify a field to retain or perform some computation in a $project stage, we must
specify all fields we wish to retain. The only exception to this is the _id field.
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