Interview question based on skill :
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Total Questions: 20
1. Which of the operator is similar to order by clause in RDBMS ?
Correct Answer is : $sort
2. Which of the following provides similar functionality to join ?
Correct Answer is : $unwin
3. Point out the wrong statement :
Correct Answer is : DESCENDING is one of the allowed results of a $let expression
4. ________ limits the number of documents in result set
Correct Answer is : $limit
5. Which of the following is used to retrieve like SELECT clause in SQL?
Correct Answer is : $project
6. _______ groups documents by some specified expression and outputs to the next stage a document for each distinct grouping.
Correct Answer is : $group
7. ____________ works similar to HAVING clause in SQL
Correct Answer is : $match
8. COUNT function is provided by _________ in MongoDB.
Correct Answer is : $sum
9. MongoDB stores additional instance-local metadata in the _______ database.
Correct Answer is : Local
10. Point out the correct statement :
Correct Answer is : mongos instances maintain a connection pool to each shard so that the mongos can reuse connections
11. The ___________ collection stores custom roles that administrators create and assign to users to provide access to specific resources.
Correct Answer is : admin.system.roles
12. The ___________ collection stores the user’s authentication credentials as well as any roles assigned to the user
Correct Answer is : admin.system.users
13. Point out the wrong statement :
Correct Answer is : The “soft” ulimit refers to the minimum number of processes that a user can have active at any time
14. The .system.indexes collection lists all the _________ in the database
Correct Answer is : indexes
15. Which of the following The collection holds special JavaScript code for use in server side JavaScript ?
Correct Answer is : .system.js
16. Which of the following can store JavaScript functions for reuse ?
Correct Answer is : system.js
17. ______ is used to load all the scripts saved in the system.js collection for the current database.
Correct Answer is : db.loadServerScripts()
18. In replica sets, each ________ maintains a connection to all other members of the set.
Correct Answer is : mongod
19. When creating a text index on multiple fields, you can specify the individual fields or you can use wildcard specifier ______
Correct Answer is : ($**)
20. When creating a text index on multiple fields, you can specify the individual fields or you can use wildcard specifier ______
Correct Answer is : ($**)
