MongoDB C100DEV Exam Practice Questions and Answers

Question 6 of 71

What mongosh function displays the indexes associated with the pets collection?

db.pets.getIndexes()

db.pets.showAllIndexes()

db.pets.indexesCollDetails()

db.pets.indexDetails()

Question 7 of 71

Given the following sample documents in the inventory collection:
Exam c100dev: Image 1

What expression will remove only one document with “status”:“A” in the inventory collection?

db.inventory.deleteMany ({“status”: “A”})

db.inventory.deleteOne ({“status”: “A”})

db.inventory.insertOne ({“status”: “A”})

db.inventory.remove ({“status”: “A”})

Question 8 of 71

Given the following sample documents:
{ _id: 1, firstName: “Person1”, company: “CompanyA”, active: false }
{ _id: 2, firstName: “Person2”, company: “CompanyB”, active: false }
{ _id: 3, firstName: “Person3”, company: “CompanyC”, active: true }
{ _id: 4, firstName: “Person4”, company: “CompanyD”, active: true }
What code block should be used to delete the third document from a MongoDB collection in Java?

collection.DeleteOne(eq(“_id”, new ObjectID(3))));

collection.Delete(eq(“_id”, new ObjectID(3))));

collection.Delete(eq(“_id”, 3));

collection.DeleteOne(eq(“_id”, 3));

Question 9 of 71

An Atlas Sample Dataset of restaurants is loaded into a database deployment.
How is Data Explorer used to find all restaurants whose name is “The Rose Palace” in the Restaurants database?

1. Select the collection on the left-hand side.
2. Select the “Aggregation” view.
3. Specify the first stage as $match query: {name: “The Rose Palace”}
4. Specify the following query: “$limit: 1”.

1. Select the collection on the left-hand side.
2. Select the “Find” view.
3. Select “Filter” and type {name: “The Rose Palace”}
4. Click “Find” to run the query.

MongoDB Data Explorer is primarily used to insert/edit/delete documents, not find them.

1. Select the collection on the left-hand side.
2. Select the “Find” view.
3. Select “Filter” and type {name == “The Rose Palace”}
4. Click “Find” to run the query.

Question 10 of 71

Assuming correct imports, properly instantiated MongoClient called client, and given the following Java code:
Exam c100dev: Image 1

What statement correctly updates a single document in MongoDB?

collection.updateSingle(filter, update);

collection.updateOne(update, filter);

collection.updateSingle(update, filter);

collection.updateOne(filter, update);