Q33. Which of the following is incorrect statement about find and findOne operations in MongoDB?

Q34. We can insert multiple documents in bulk using which of the following operations:

Q35. As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

Q36. Which command is used to determine storage capacity of specific database?

Q37. In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)

Q38. By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

Q39. MongoDB is

Q40. Update If Correct is an approach for which of the following concepts in MongoDB:

Q41. Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:”ruben”,apellido:”gomez”},{nombre:l,apellido:l,aficion:l});

Q42. Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?

Q43. Consider the following example document from the sample collection. All documents in this collection have the same schema.

Which of the following queries will replace this with the document.

Q44. The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

Q45. Below is a sample document of “orders” collection

Q46. In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

Q47. Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

Q48. What does the totalKeysExamined field returned by the explain method indicate?

Q49. Consider the following document:
> db.c.find()
{ “_id” : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the “c” collection will return only the first five elements of the array in the
“b”
field? E.g.,
Document you want returned by your query:
{ “_id” : 12, “b” : [ 3, 5, 7, 2, 1 ] >

Q50. Which of the following is a valid Replica Set configuration if you want:
1-Have 3 copies of everything
2- That RS3 is never primary
2- 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)

Q51. Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

Q52. To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

Q53. 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?

Q54. Which of the following needs to be performed prior to initiate backup on a sharded cluster?

Q55. 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?