MongoDB interview questions part 36
MongoDB interview questions part 36
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Total Questions: 20
1. __________ returns the highest value from the group of values in documents.
Correct Answer is : $max
2. Which of the following is syntax for calculating minimum value ?
Correct Answer is : { $min: }
3. If all documents for the $min operation have null value for the field or are missing the field, the $min operator returns ____ for the minimum value.
Correct Answer is :
4. $addToSet returns an array of all _______ values that results from applying an expression to each document.
Correct Answer is : unique
5. ______ expressions ignores the duplicate entries in each input array and the order of the elements.
Correct Answer is : set
6. Point out the correct statement :
Correct Answer is : Operator expressions are similar to functions that take arguments
7. Point out the wrong statement :
Correct Answer is : None of the mentioned
8. $allElementsTrue returns true if no element of a set evaluates to :
Correct Answer is : FALSE
9. Which of the following storage engine is supported by default ?
Correct Answer is : MMAPv1
10. Point out the correct statement :
Correct Answer is : MongoDB includes support for two storage engines
11. All collections have a unique ________ lock that allows multiple clients to modify documents in different collections at the same time.
Correct Answer is : readers-writer
12. _________ supports concurrent access by readers and writers to the documents in a collection.
Correct Answer is : WiredTiger
13. Point out the correct statement :
Correct Answer is : The MongoDB distribution for Solaris include support for the WiredTiger storage engine
14. MongoDB uses ________ logging to an on-disk journal.
Correct Answer is : write ahead
15. _______ concern describes the guarantee that MongoDB provides when reporting on the success of a write operation.
Correct Answer is : Write
16. The ________ command returns information regarding the number of open connections
Correct Answer is : connPoolStats
17. ________ do not typically provide sufficient performance to support a MongoDB deployment
Correct Answer is : RAID-5
18. Which of the following should be avoided with MongoDB Deployments ?
Correct Answer is : RAID-0
19. The __________ of a replica set affects the outcome of failover situations.
Correct Answer is : deployment
20. Point out the wrong statement :
Correct Answer is : Network partitions could not prevent the set from being able to form a majority
