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Microsoft DP-420 Exam Syllabus Topics:

Section	Objectives
Topic 1: Design and implement data models for Azure Cosmos DB	- Model data for NoSQL workloads 1. Partitioning strategies 2. Data modeling patterns (embed vs reference) - Design indexing strategies 1. Indexing policies 2. Query optimization considerations
Topic 2: Design and implement data distribution	- Replication and consistency 1. Multi-region replication 2. Consistency levels - Partitioning and scaling 1. Logical and physical partitions 2. Throughput (RU/s) planning
Topic 3: Integrate Azure Cosmos DB with Azure services	- Event-driven architectures 1. Change Feed processing 2. Integration with Azure Functions - Data pipelines and analytics 1. Data movement patterns 2. Synapse integration
Topic 4: Optimize and maintain Cosmos DB solutions	- Performance optimization 1. RU consumption optimization 2. Query performance tuning - Monitoring and troubleshooting 1. Diagnostics and logging 2. Alerts and metrics

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Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB Sample Questions (Q26-Q31):

NEW QUESTION # 26
You have an Azure Cosmos DB for NoSQL account that contains a database named DB1. Users run the following query against DB1.

You add an index to the recordset.
You need to change the ORDER by syntax of the query to optimize the use of the index. The solution must NOT change the result set.
Which syntax should you use?
Which syntax should you use?

A. ORDER BY c._ts MSC, c.bikeParts ASC
B. ORDER BY c.bikeParts ASC, c._ts ASC
C. ORDER BY c._ts ASC, c.bikeParts DESC
D. order BY c.bikeParts DESC, c._ts ASC

Answer: B

NEW QUESTION # 27
You have a container named container1 in an Azure Cosmos DB for NoSQL account named account1 that is set to the session default consistency level. The average size of an item in contained is 20 KB.
You have an application named App1 that uses the Azure Cosmos DB SDK and performs a point read on the same set of items in container1 every minute.
You need to minimize the consumption of the request units (RUs) associated to the reads by App1.
What should you do?

A. In App1, modify the connection policy settings
B. In account1, change the default consistency level to bounded staleness
C. In App1, change the consistency level of read requests to consistent prefix
D. In account1, provision a dedicated gateway and integrated cache

Answer: D

Explanation:
The main goal of the integrated cache is to reduce costs for read-heavy workloads. Low latency, while helpful, is not the main benefit of the integrated cache because Azure Cosmos DB is already fast without caching.
Point reads and queries that hit the integrated cache won't use any RUs. In other words, any cache hits will have an RU charge of 0. Cache hits will have a much lower per-operation cost than reads from the backend database.
Workloads that fit the following characteristics should evaluate if the integrated cache will help lower costs:
- Read-heavy workloads
- Many repeated point reads on large items
- Many repeated high RU queries
- Hot partition key for reads
Reference:
https://docs.microsoft.com/en-us/azure/cosmos-db/integrated-cache

NEW QUESTION # 28
You have an Azure Cosmos DB for NoSQL account.
The change feed is enabled on a container named invoice.
You create an Azure function that has a trigger on the change feed.
What is received by the Azure function?

A. only the partition key and the changed properties of the updated items
B. all the properties of the original items and the updated items
C. all the properties of the updated items
D. only the changed properties and the system-defined properties of the updated items

Answer: C

Explanation:
Explanation
According to the Azure Cosmos DB documentation12, the change feed is a persistent record of changes to a container in the order they occur. The change feed outputs the sorted list of documents that were changed in the order in which they were modified.
The Azure function that has a trigger on the change feed receives all the properties of the updated items2. The change feed does not include the original items or only the changed properties. The change feed also includes some system-defined properties such as _ts (the last modified timestamp) and _lsn (the logical sequence number)3.
Therefore, the correct answer is: A. all the properties of the updated items

NEW QUESTION # 29
You have an Azure Cosmos DB for NoSQL account1 that is configured for automatic failover. The account1 account has a single read-write region in West US and a and a read region in East US.
You run the following PowerShell command.

What is the effect of running the command?

A. A manual failover will occur.
B. The account will be unavailable to writes during the change.
C. The provisioned throughput for account1 will increase.
D. The account will be configured for multi-region writes.

Answer: B

Explanation:
You can use the Set-AzCosmosDBAccountRegion cmdlet to update the regions that an Azure Cosmos DB account uses. You can use this cmdlet to add a region or change the region failover order. The cmdlet requires a resource group name, an Azure Cosmos DB account name, and a list of regions in desired failover order 1 .
For your scenario, based on the PowerShell command, you are using the Set-AzCosmosDBAccountRegion cmdlet to update the regions for an Azure Cosmos DB account named account1 that is configured for automatic failover. The command specifies two regions: West US and East US. The effect of running the command is that the account will be configured for multi-region writes .
Multi-region writes is a feature of Azure Cosmos DB that allows you to write data to any region in your account and have it automatically replicated to all other regions. This feature provides high availability and low latency for write operations across multiple regions. To enable multi-region writes, you need to specify at least two regions in your account and set them as write regions 2 . In your command, you are setting both West US and East US as write regions by using the -IsZoneRedundant parameter with a value of $true for both regions.

NEW QUESTION # 30
You have a container named container1 in an Azure Cosmos DB for NoSQL 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. Cosmos DB Built-in Data Contributor only
B. CosmosDB Operator only
C. DocumentDB Account Contributor only
D. DocumentDB Account Contributor and Cosmos DB Built-in Data Contributor

Answer: A

Explanation:
https://docs.microsoft.com/en-us/azure/cosmos-db/how-to-setup-rbac

NEW QUESTION # 31
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