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DP-420 Practice Questions

Question # 1

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 # 2

You have a container in an Azure Cosmos DB Core (SQL) API account.
You need to use the Azure Cosmos DB SDK to replace a document by using optimistic
concurrency.
What should you include in the code? To answer, select the appropriate options in the
answer area.
NOTE: Each correct selection is worth one point.


Question # 3

You have a database in an Azure Cosmos DB Core (SQL) API account.
You need to create an Azure function that will access the database to retrieve records
based on a variable named accountnumber. The solution must protect against SQL
injection attacks.
How should you define the command statement in the function?

A.

cmd = "SELECT * FROM Persons p
WHERE p.accountnumber = 'accountnumber'"

B.

cmd = "SELECT * FROM Persons p
WHERE p.accountnumber = LIKE @accountnumber"

C.

cmd = "SELECT * FROM Persons p
WHERE p.accountnumber = @accountnumber"

D.

cmd = "SELECT * FROM Persons p
WHERE p.accountnumber = '" + accountnumber + "'"



C.

cmd = "SELECT * FROM Persons p
WHERE p.accountnumber = @accountnumber"


Explanation:
Azure Cosmos DB supports queries with parameters expressed by the familiar @ notation.
Parameterized SQL provides robust handling and escaping of user input, and prevents
accidental exposure of data through SQL injection.
For example, you can write a query that takes lastName and address.state as parameters,
and execute it for various values of lastName and address.state based on user input.
SELECT *
FROM Families f
WHERE f.lastName = @lastName AND f.address.state = @addressState
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/sql-queryparameterized-
queries


Question # 4

You have the following query.
SELECT * FROM
WHERE c.sensor = "TEMP1"
AND c.value < 22
AND c.timestamp >= 1619146031231
You need to recommend a composite index strategy that will minimize the request units
(RUs) consumed by the query.
What should you recommend?

A.

a composite index for (sensor ASC, value ASC) and a composite index for (sensor ASC,
timestamp ASC)

B.

a composite index for (sensor ASC, value ASC, timestamp ASC) and a composite index
for (sensor DESC, value DESC, timestamp DESC)

C.

a composite index for (value ASC, sensor ASC) and a composite index for (timestamp
ASC, sensor ASC)

D.

a composite index for (sensor ASC, value ASC, timestamp ASC)



A.

a composite index for (sensor ASC, value ASC) and a composite index for (sensor ASC,
timestamp ASC)


If a query has a filter with two or more properties, adding a composite index will improve
performance.
Consider the following query:
SELECT * FROM c WHERE c.name = “Tim” and c.age > 18
In the absence of a composite index on (name ASC, and age ASC), we will utilize a range
index for this query. We can improve the efficiency of this query by creating a composite
index for name and age.
Queries with multiple equality filters and a maximum of one range filter (such as >,<, <=,
>=, !=) will utilize the composite index.
Reference: https://azure.microsoft.com/en-us/blog/three-ways-to-leverage-compositeindexes-
in-azure-cosmos-db/


Question # 5

You have an Azure Cosmos DB Core (SQL) API account named storage1 that uses
provisioned throughput capacity mode.
The storage1 account contains the databases shown in the following table.


Question # 6

You need to implement a trigger in Azure Cosmos DB Core (SQL) API that will run before
an item is inserted into a container.
Which two actions should you perform to ensure that the trigger runs? Each correct answer
presents part of the solution.
NOTE: Each correct selection is worth one point.

A.

Append pre to the name of the JavaScript function trigger.

B.

For each create request, set the access condition in RequestOptions.

C.

Register the trigger as a pre-trigger.

D.

For each create request, set the consistency level to session in RequestOptions.

E.

For each create request, set the trigger name in RequestOptions.



C.

Register the trigger as a pre-trigger.


Explanation:
C: When triggers are registered, you can specify the operations that it can run with.
F: When executing, pre-triggers are passed in the RequestOptions object by specifying
PreTriggerInclude and then passing the name of the trigger in a List object.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/how-to-use-storedprocedures-
triggers-udfs


Question # 7

You have a container named container1 in an Azure Cosmos DB Core (SQL) API account.
The container1 container has 120 GB of data.
The following is a sample of a document in container1.


Question # 8

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 Azure Monitor alert to trigger the function.
Does this meet the goal?

A.

Yes

B.

No



A.

Yes


Explanation:
You can set up alerts from the Azure Cosmos DB pane or the Azure Monitor service in the
Azure portal.
Note: Alerts are used to set up recurring tests to monitor the availability and
responsiveness of your Azure Cosmos DB resources. Alerts can send you a notification in
the form of an email, or execute an Azure Function when one of your metrics reaches the
threshold or if a specific event is logged in the activity log.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/create-alerts


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Microsoft DP-420 Exam Dumps

Exam Name: Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB
Certification Name: Microsoft Certified: Azure Cosmos DB Developer Specialty

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