NO.28 Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

NO.29 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?

NO.30 Which of the following statements are true about the $match pipeline operator? Check all that apply.

NO.31 Which is the default mode in which the explain() command runs?

NO.32 What is the maximum size of a MongoDB document

NO.33 Which of the following are common uses of the mongo shell? Check all that apply

NO.34 Below is a sample document in a given collection test.
{ a : 5, b : 3, c: 2, d : 1 >
Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.

NO.35 Which node in a replica set does accept write operation?

NO.36 Which of the following operators is used to updated a document partially?

NO.37 What does the following aggregate query perform?

NO.38 Which of the following needs to be performed prior to initiate backup on a sharded cluster?

NO.39 In a sharded cluster, from which node does one stop the balancer process before initiating backup?

NO.40 ‘$set’ sets the value of

NO.41 What tool do you use if you want to extract a CSV from mongo?

NO.42 You have the following index on the toys collection:
{
“manufacturer” : 1,
“name” : 1,
“date” : -1
}
Which of the following is able to use the index for the query? Check all that apply.

NO.43 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?

NO.44 Consider the following example document:
{
“_id”: Objectld(“5360c0a0a655a60674680bbe”),
“user”
“login”: “irOn”
“description”: “Made of steel”
“date”: ISODate(“2014-04-30T09:16:45.836Z”),
}
>
and index creation command:
db.users.createlndex( { “user.login”: 1, “user.date”: -1 }, “mylndex” ) When performing the following query:
db.users.find( { “user.login”: /Air.*/ },
{ “user”:1, “_id”:0 > ).sort( { “user.date”:1 > )
which of the following statements correctly describe how MongoDB will handle the query? Check all that apply.

NO.45 Which of the following is true about sharding?

NO.46 In which of the following scenarios is sharding not the correct option. Select all that apply.

NO.47 Which are the ONLY ways to project portions of an array?

NO.48 In mongodb how do you update a document partially?

NO.49 Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })

NO.50 In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)