MongoDB Interview Questions - 34 | Snaprecruit.com

MongoDB Interview Questions - 34 | Snaprecruit.com

MongoDB interview questions part 34

MongoDB interview questions part 34

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Total Questions: 20

1. ____________ does not provide query execution information for the rejected plans.

Correct Answer is : executionStats

2. Point out the correct statement :

Correct Answer is : When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys

3. _________ corresponds to the millis field returned by cursor.explain() in earlier versions of MongoDB.

Correct Answer is : executionTimeMillis

4. For sharded collections, explain returns the __________ for each accessed shard.

Correct Answer is : serverInfo

5. Point out the wrong statement :

Correct Answer is : If MongoDB can use an index scan to obtain the requested sort order, the result will not include a SORT stage

6. If the query planner selects a collection scan, the explain result includes a _________ stage.

Correct Answer is : COLLSCAN

7. Which of the following parameter specifies the verbosity mode for the explain output ?

Correct Answer is : verbose

8. In _____________ mode, MongoDB returns statistics describing the execution of the winning plan as well as statistics for the other candidate plans captured during plan selection.

Correct Answer is : allPlansExecution

9. If the query planner selects an _________, the explain result includes a IXSCAN stage.

Correct Answer is : Index

10. _________ which provides information on the MongoDB instance.

Correct Answer is : serverInfo

11. Which of the following returns a substring of a string ?

Correct Answer is : $substr

12. Point out the correct statement :

Correct Answer is : $toLower converts a string to lowercase

13. Which of the following accepts a single argument expression ?

Correct Answer is : $toUpper

14. Which of the following performs case-insensitive string comparison ?

Correct Answer is : $strcasecmpequals

15. Point out the wrong statement :

Correct Answer is : None of the mentioned

16. _______ is used for access text search metadata.

Correct Answer is : $meta

17. Which of the following accepts named parameters ?

Correct Answer is : None of the mentioned

18. _______ returns the number of elements in the array.

Correct Answer is : $size

19. _________ returns a value without parsing.

Correct Answer is : $literal

20. db.collection.aggregate() returns a _______ and can return result sets of any size.

Correct Answer is : cursor

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