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Microsoft DP-420 Exam Sample Questions

Question # 1

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 + "'"

Answer

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

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Question # 2

You have an Azure Cosmos DB Core (SQL) API account named account1. In account1, you run the following query in a container that contains 100GB of data. SELECT * FROM c WHERE LOWER(c.categoryid) = "hockey" You view the following metrics while performing the query.

---

Question # 3

The settings for a container in an Azure Cosmos DB Core (SQL) API account are configured as shown in the following exhibit. Which statement describes the configuration of the container?

A. All items will be deleted after one year.

B. Items stored in the collection will be retained always, regardless of the items time to live value.

C. Items stored in the collection will expire only if the item has a time to live value.

D. All items will be deleted after one hour.

Answer

C.

Items stored in the collection will expire only if the item has a time to live value.

When DefaultTimeToLive is -1 then your Time to Live setting is On (No default)
Time to Live on a container, if present and the value is set to "-1", it is equal to infinity, and
items don’t expire by default.
Time to Live on an item:
This Property is applicable only if DefaultTimeToLive is present and it is not set to null for
the parent container.
If present, it overrides the DefaultTimeToLive value of the parent container.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/time-to-live

---

Question # 4

You have a database in an Azure Cosmos DB Core (SQL) API account. You plan to create a container that will store employee data for 5,000 small businesses. Each business will have up to 25 employees. Each employee item will have an emailAddress value. You need to ensure that the emailAddress value for each employee within the same company is unique. To what should you set the partition key and the unique key? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

---

Question # 5

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 the function to have an Azure CosmosDB trigger. Does this meet the goal?

A. Yes

B. No

Answer

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

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