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Microsoft DP-420 Exam Sample Questions


Question # 1

You are designing an Azure Cosmos DB Core (SQL) API solution to store data from IoT
devices. Writes from the devices will be occur every second.
The following is a sample of the data.

You need to select a partition key that meets the following requirements for writes:
Minimizes the partition skew
Avoids capacity limits
Avoids hot partitions
What should you do?

A.

Use timestamp as the partition key.

B.

Create a new synthetic key that contains deviceId and sensor1Value

C.

Create a new synthetic key that contains deviceId and deviceManufacturer.

D.

Create a new synthetic key that contains deviceId and a random number.



D.

Create a new synthetic key that contains deviceId and a random number.


Explanation:
Use a partition key with a random suffix. Distribute the workload more evenly is to append
a random number at the end of the partition key value. When you distribute items in this
way, you can perform parallel write operations across partitions.


Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/synthetic-partition-keys





Question # 2

Note: This question is part of a series of questions that present the same scenario. Each
question in the series contains a unique solution that might meet the stated goals. Some
question sets might have more than one correct solution, while others might not have a
correct solution.
After you answer a question in this section, you will NOT be able to return to it. As a result,
these questions will not appear in the review screen.
You have an Azure Cosmos DB Core (SQL) API account named account 1 that uses
autoscale throughput.
You need to run an Azure function when the normalized request units per second for a
container in account1 exceeds a specific value.
Solution: You configure an application to use the change feed processor to read the
change feed and you configure the application to trigger the function.
Does this meet the goal?

A.

Yes

B.

No



B.

No


Explanation:
Instead configure an Azure Monitor alert to trigger the function.
You can set up alerts from the Azure Cosmos DB pane or the Azure Monitor service in the
Azure portal.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/create-alerts





Question # 3

You have an Azure Cosmos DB Core (SQL) API account.
You configure the diagnostic settings to send all log information to a Log Analytics
workspace.
You need to identify when the provisioned request units per second (RU/s) for resources
within the account were modified.
You write the following query.
AzureDiagnostics
| where Category == "ControlPlaneRequests"
What should you include in the query?

A.

| where OperationName startswith "AccountUpdateStart"

B.

I where OperationName startswith "SqlContainersDelete"

C.

I where OperationName startswith "MongoCollectionsThroughputUpdate"

D.

| where OperationName startswith "SqlContainersThroughputUpdate"



A.

| where OperationName startswith "AccountUpdateStart"


Explanation:
The following are the operation names in diagnostic logs for different operations:
RegionAddStart, RegionAddComplete
RegionRemoveStart, RegionRemoveComplete
AccountDeleteStart, AccountDeleteComplete
RegionFailoverStart, RegionFailoverComplete
AccountCreateStart, AccountCreateComplete
*AccountUpdateStart*, AccountUpdateComplete
VirtualNetworkDeleteStart, VirtualNetworkDeleteComplete
DiagnosticLogUpdateStart, DiagnosticLogUpdateComplete
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/audit-control-plane-logs





Question # 4

You are developing an application that will use an Azure Cosmos DB Core (SQL) API
account as a data source.
You need to create a report that displays the top five most ordered fruits as shown in the
following table.

A.

Option A

B.

Option B

C.

Option C

D.

Option D



B.

Option B


D.

Option D


Explanation:
ARRAY_CONTAINS returns a Boolean indicating whether the array contains the specified
value. You can check for a partial or full match of an object by using a boolean expression
within the command.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/sql-query-array-contains





Question # 5

You provision Azure resources by using the following Azure Resource Manager (ARM)
template.




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