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VOOZH | about |
Question 1
What is the purpose of the MongoDB aggregation framework?
To modify existing documents
To perform complex data transformations and analysis
To store multiple collections in a database
To enforce schema validation
Question 2
Which aggregation stage is used to group documents based on a specific field?
$match
$group
$lookup
$sort
Question 3
What does the $lookup stage do in MongoDB aggregation?
Retrieves documents from another collection
Sorts documents in ascending or descending order
Filters documents based on conditions
Removes duplicate documents from the result
Question 4
Which aggregation stage is used to filter documents before processing?
$filter
$match
$sort
$project
Question 5
What is the primary purpose of the $out stage in MongoDB aggregation?
Outputs results as a new collection
Displays results in a formatted way
Exports aggregation results to a JSON file
Removes specific fields from the output
Question 6
What is the main advantage of using indexes in MongoDB?
Reduce storage space
Improve query performance
Increase document size
Prevent duplicate records
Question 7
How do you create an index on a single field in MongoDB?
db.collection.addIndex({ field: 1 })
db.collection.createIndex({ field: 1 })
db.collection.index({ field: 1 })
db.collection.ensureIndex({ field: 1 })
Question 8
Which type of index is used to search text in MongoDB?
Single field index
Compound index
Text index
Multikey index
Question 9
What happens when you drop an index in MongoDB?
The index is permanently removed
The collection is deleted
MongoDB rolls back to an older state
Queries become more efficient
Question 10
What is the purpose of a compound index in MongoDB?
To store multiple indexes in one collection
To allow indexing on multiple fields
To create a separate collection for indexed fields
To convert numeric fields into indexed strings
There are 10 questions to complete.
