MongoDB Certified DBA Associate Exam C100DBA Real Dumps Questions

1. Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.

2. The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

3. In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)

4. CORRECT TEXT

What tool do you use to see if you have a problem in the consumption of disk I / 0?

5. Which of the following is supported by MongoDB?

6. The MongoDB explain() method does not support which of the following verbosity mode:

7. Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc.

Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

8. In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal.

What should be the value of j?

9. Aggregation Pipelines have a limit of:

10. What is the maximum size of a MongoDB document?

11. If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?

12. Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

13. Which option should be used to update all the documents with the specified condition in the MongoDB query?

14. Which mongodb tool is used to report details on number of database operations in MongoDB?

15. In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal.

What should be the value of j?

16. What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?

17. Which of the following operators is used to updated a document partially?

18. What is the first task that a secondary would perform on being prompted by another secondary for an election?

19. Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.

db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )

20. JSON stands for

21. What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?

22. Which operations add new documents to a collection?

23. Consider that you have a collection called population which has fields state and city.

Which of the following query will calculate the population grouped by state and city?

24. Which of the following is true about sharding?

25. Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

26. What is the output of the following program?

27. Which node in a replica set does accept write operation?

28. Using an arbiter allows one to easily ensure an odd number of voters in replica sets.

Why is this important?

29. Which of the following statements are true about the $match pipeline operator? Check all that apply.

30. That RSI and RS2 can be primary?

You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need 3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that .

In a 4-member RS RSO, RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have replicated RSI and RS2 (but NOT RS3), who can get up as the new primary?

The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember)

31. Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary.

Assuming no other problems occur, which of the following describes what is most likely to happen?

32. Which command can be used to rebuild the indexes on a collection in MongoDB?

33. What does the totalKeysExamined field returned by the explain method indicate?

34. In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

35. Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

36. Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});

37. MongoDB is

38. Which are the ONLY ways to project portions of an array?

39. In a replicated cluster, which of the following node would only be used during an election?

40. Which of the following node is used during election in a replication cluster?