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DP-420 Exam FAQ: What Candidates Ask About Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB

Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB Sample Questions:

Question 1

You are working on an app that will save the device metrics produced every minute by various IoT devices.
You decide to collect the data for two entities; the devices and the device metrics produced by each device.
You were about to create two containers for these identified entities but suddenly your data engineer suggests placing both entities in a single container, not in two different containers.
What would you do?

A. Create a document with the deviceid property and other device data, and add a property called
"type" with the value 'device'. Create another document for each metrics data using the devicemetricsid and deviceid properties and add a property called "type" with the value devicemetrics.
B. Create a document with the deviceid property and other device data. After that embed each metrics collection into the document with the devicemetricsid property and all the metrics data.
C. None of these.
D. Create a document with the deviceid property and other device data, and add a property called
'type' having the value 'device'. Also, create another document for each metrics data collected using devicemetricsid property.

Question 2

Hotspot Question
You have an Azure Cosmos DB for NoSQL account that hosts a container named Container1.
You are developing an Azure Function named Function1.
You need to ensure that Function1 will be triggered when an item is created or updated in Container1.
How should you complete the function? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

Question 3

You plan to create an Azure Cosmos DB for NoSQL account that will use customer-managed keys stored in Azure Key Vault.
You need to configure an access policy in Key Vault to allow Azure Cosmos DB access to the keys.
Which three permissions should you enable in the access policy? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

A. List
B. Sign
C. Wrap Key
D. Verify
E. Unwrap Key
F. Update
G. Get

Question 4

Which of the following is the most optimal method of managing referential integrity between different containers in Azure Cosmos DB?

A. All are equally efficient
B. Using an Azure Function trigger for Azure Cosmos DB to leverage on the change feed processor to update the referenced containers
C. Creating an Azure Cosmos DB Function that will periodically search for changes done to your containers and replicate those changes to the referenced containers
D. When any changes are created by your app to one container, also ensure it duplicates the changes on the referenced container

Question 5

Hotspot Question
You have an Azure subscription that contains an Azure Cosmos DB for NoSQL account. The account hosts two containers named Customers and Sale Transactions. The Customers container stores customer data.
Each customer data item includes a field named numberOfSales that must be updated when an item is added to the SaleTransactions container.
You need to ensure referential integrity between the containers. The solution must meet the following requirements:
- Detect changes to the SaleTransactions container.
- Apply a new aggregate count to the related items in the Customers
container.
What should you use to implement each requirement? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

Solutions: