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DP-420 Practice Questions

Question # 1

You have an application named App1 that reads the data in an Azure Cosmos DB Core
(SQL) API account. App1 runs the same read queries every minute. The default
consistency level for the account is set to eventual.
You discover that every query consumes request units (RUs) instead of using the cache.
You verify the IntegratedCacheiteItemHitRate metric and the
IntegratedCacheQueryHitRate metric. Both metrics have values of 0.
You verify that the dedicated gateway cluster is provisioned and used in the connection string.
You need to ensure that App1 uses the Azure Cosmos DB integrated cache.
What should you configure?

A.

the indexing policy of the Azure Cosmos DB container

B.

the consistency level of the requests from App1

C.

the connectivity mode of the App1 CosmosClient

D.

the default consistency level of the Azure Cosmos DB account



C.

the connectivity mode of the App1 CosmosClient


Explanation: Because the integrated cache is specific to your Azure Cosmos DB account
and requires significant CPU and memory, it requires a dedicated gateway node. Connect
to Azure Cosmos DB using gateway mode.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/integrated-cache-faq



Question # 2

You have an Azure Cosmos DB Core (SQL) API account named account1 that has the
disableKeyBasedMetadataWriteAccess property enabled.
You are developing an app named App1 that will be used by a user named DevUser1 to
create containers in account1. DevUser1 has a non-privileged user account in the Azure
Active Directory (Azure AD) tenant.
You need to ensure that DevUser1 can use App1 to create containers in account1.
What should you do? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.



Question # 3

You have a container named container1 in an Azure Cosmos DB Core (SQL) API account.
You need to provide a user named User1 with the ability to insert items into container1 by
using role-based access control (RBAC). The solution must use the principle of least
privilege.
Which roles should you assign to User1?

A.

CosmosDB Operator only

B.

DocumentDB Account Contributor and Cosmos DB Built-in Data Contributor

C.

DocumentDB Account Contributor only

D.

Cosmos DB Built-in Data Contributor only



A.

CosmosDB Operator only


Explanation:
Cosmos DB Operator: Can provision Azure Cosmos accounts, databases, and containers.
Cannot access any data or use Data Explorer.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/role-based-access-control



Question # 4

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 a container named container1 in an Azure Cosmos DB Core (SQL) API account.
You need to make the contents of container1 available as reference data for an Azure
Stream Analytics job.
Solution: You create an Azure function that uses Azure Cosmos DB Core (SQL) API
change feed as a trigger and Azure event hub as the output.
Does this meet the goal?

A.

Yes

B.

No



A.

Yes


Explanation:
The Azure Cosmos DB change feed is a mechanism to get a continuous and incremental
feed of records from an Azure Cosmos container as those records are being created or
modified. Change feed support works by listening to container for any changes. It then
outputs the sorted list of documents that were changed in the order in which they were
modified.
The following diagram represents the data flow and components involved in the solution:

Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/changefeedecommerce-
solution



Question # 5

You have a container named container1 in an Azure Cosmos DB Core (SQL) API account. Upserts of items in container1 occur every three seconds.
You have an Azure Functions app named function1 that is supposed to run whenever items
are inserted or replaced in container1.
You discover that function1 runs, but not on every upsert.
You need to ensure that function1 processes each upsert within one second of the upsert.
Which property should you change in the Function.json file of function1?

A.

checkpointInterval

B.

leaseCollectionsThroughput

C.

maxItemsPerInvocation

D.

feedPollDelay



D.

feedPollDelay


Explanation:
With an upsert operation we can either insert or update an existing record at the same
time.
FeedPollDelay: The time (in milliseconds) for the delay between polling a partition for new
changes on the feed, after all current changes are drained. Default is 5,000 milliseconds, or
5 seconds.
Reference: https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindingscosmosdb-
v2-trigger



Question # 6

You configure multi-region writes for account1.
You need to ensure that App1 supports the new configuration for account1. The solution
must meet the business requirements and the product catalog requirements.
What should you do?

A.

Set the default consistency level of accountl to bounded staleness.

B.

Create a private endpoint connection.

C.

Modify the connection policy of App1.

D.

Increase the number of request units per second (RU/s) allocated to the con-product
and con-productVendor containers.



D.

Increase the number of request units per second (RU/s) allocated to the con-product
and con-productVendor containers.


Explanation:
App1 queries the con-product and con-productVendor containers.
Note: Request unit is a performance currency abstracting the system resources such as
CPU, IOPS, and memory that are required to perform the database operations supported
by Azure Cosmos DB.
Scenario:
Develop an app named App1 that will run from all locations and query the data in account1.
Once multi-region writes are configured, maximize the performance of App1 queries
against the data in account1.
Whenever there are multiple solutions for a requirement, select the solution that provides
the best performance, as long as there are no additional costs associated.
Reference:
https://docs.microsoft.com/en-us/azure/cosmos-db/consistency-levels



Question # 7

You need to select the partition key for con-iot1. The solution must meet the IoT telemetry
requirements.
What should you select?

A.

the timestamp

B.

the humidity

C.

the temperature

D.

the device ID



D.

the device ID


Explanation:
The partition key is what will determine how data is routed in the various partitions by
Cosmos DB and needs to make sense in the context of your specific scenario. The IoT
Device ID is generally the "natural" partition key for IoT applications.
Scenario: The iotdb database will contain two containers named con-iot1 and con-iot2.
Ensure that Azure Cosmos DB costs for IoT-related processing are predictable.
Reference:
https://docs.microsoft.com/en-us/azure/architecture/solution-ideas/articles/iot-usingcosmos-
db



Question # 8

You have a database in an Azure Cosmos DB Core (SQL) API account. The database is
backed up every two hours.
You need to implement a solution that supports point-in-time restore.
What should you do first?

A.

Enable Continuous Backup for the account.

B.

Configure the Backup & Restore settings for the account.

C.

Create a new account that has a periodic backup policy.

D.

Configure the Point In Time Restore settings for the account.



A.

Enable Continuous Backup for the account.


Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/provision-accountcontinuous-
backup



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