Free MongoDB C100DEV Exam Questions

Suppose you insert the following documents into a companies collection:

db.companies.insertMany([

    {"name": "Facebook"}, 

    {"name": "X"}

])

Select all true statements about this command. (Select three)

Consider the following scenario: You have a MongoDB collection named users that stores user information. Each document in the collection has the following structure:

{

  "_id": ObjectId("609fe4b5728ad805aef1a88d"),

  "name": "John Doe",

  "age": 30,

  "email": "johndoe@example.com",

  "address": {

    "street": "123 Main St",

    "city": "New York",

    "state": "NY",

    "zipcode": "10001"

  }

}

You need to retrieve all the documents from the users collection and convert them to an array format. Which of the following MongoDB queries should you use for this task?

You manage a MongoDB collection called inventory that stores documents for a store's inventory. Each document has the fields item, category, and quantity. You want to ensure that an item is always present in the collection, even if it needs to be inserted. Specifically, if the item "notebook" in the "Stationery" category does not exist, it should be inserted with a quantity of 50. If it does exist, its quantity should be updated to 50. You plan to use the following command:

db.inventory.updateOne(

  { "item": "notebook", "category": "Stationery" },

  { $set: { "quantity": 50 } },

  { upsert: true }

)

What will happen after executing this command if there is no "notebook" item in the "Stationery" category in the inventory collection?

Suppose you have a products collection with an index:

{ product_category: 1 }

For which of the following queries can MongoDB look at only a subset of the index entries, rather than all of the index entries?