QUESTION 50
‘$set’ sets the value of

QUESTION 51
MongoDB is

QUESTION 52
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.

QUESTION 53
MongoDB is a schema-less design.

QUESTION 54
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)

QUESTION 55
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

QUESTION 56
Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

QUESTION 57
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?

QUESTION 58
Which of the following about Capped Collections is correct?

QUESTION 59
Which of the following operator can be used to control the number of items of an array that a query returns?

QUESTION 60
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?

QUESTION 61
In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)

QUESTION 62
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest.
Which comparison order is used?

QUESTION 63
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?

QUESTION 64
Which of the following does MongoDB use to provide High Scalability?

QUESTION 65
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest. Which comparison order is used?

QUESTION 66
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?

QUESTION 67
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:

QUESTION 68
Below is a sample document of “orders” collection