MongoDB interview questions part 3
MongoDB interview questions part 3
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. ________ applies an expression to each item in an array and returns an array with the applied results.
Correct Answer is : $map
2. In the vars assignment block, ________ refers to the value of an externally defined variable low .
Correct Answer is : “$$low”
3. To avoid treating numeric or boolean literals as projection flags, use the _______ expression to wrap the numeric or boolean literals.
Correct Answer is : $literal
4. MongoDB treats the literals as projection flags, valid only in the _______ stage.
Correct Answer is : $project
5. Point out the wrong statement :
Correct Answer is : $project reshapes each document in the stream, such as by adding new fields or removing existing fields
6. ________ passes the first n documents unmodified to the pipeline where n is the specified limit
Correct Answer is : $limit
7. _______ reorders the document stream by a specified sort key
Correct Answer is : $sort
8. Which of the following operator incorporates the functionality of $match, $sort, and $limit for geospatial data?
Correct Answer is : $geoNear
9. _____ Writes the resulting documents of the aggregation pipeline to a collection.
Correct Answer is : $out
10. ________ deconstructs an array field from the input documents to output a document for each element.
Correct Answer is : $unwin
11. Aggregation pipeline was introduced in MongoDB version ______
Correct Answer is : 2.2
12. Point out the wrong statement :
Correct Answer is : All of the mentioned
13. ________ calculates aggregate values for the data in a collection.
Correct Answer is : db.collection.aggregate
14. Cursors returned from aggregation only supports cursor methods like :
Correct Answer is : cursor.hasNext()
15. Point out the wrong statement :
Correct Answer is : Pipeline stages do need to produce one output document for every input document
16. ______ can be used to iterate the cursor of document results returned by db.collection.find().
Correct Answer is : it
17. To handle large datasets, set _________ option to true to enable writing data to temporary files.
Correct Answer is : allowDiskUse
18. Syntax for specifying an initial batch size for the cursor is :
Correct Answer is : cursor: { batchSize: }
19. Query shape consists of a combination of query, sort, and _________ specifications.
Correct Answer is : collection
20. Which of the following method is overrided by Index filters ?
Correct Answer is : hint
