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Microsoft DP-420 Exam Syllabus Topics:

Section	Weight	Objectives
Optimize an Azure Cosmos DB solution	15-20%	- Define and implement indexing strategy 1. Exclude or include properties 2. Select index types and paths - Work with change feed 1. Trigger downstream workflows 2. Process changes incrementally - Optimize query performance 1. Optimize throughput allocation 2. Tune query structure and syntax
Design and implement data distribution	5-10%	- Manage data distribution and failover 1. Manage regional availability 2. Define failover priorities - Design replication strategy 1. Configure multi-region replication 2. Implement multi-region write
Maintain an Azure Cosmos DB solution	25-30%	- Implement backup and restore 1. Configure periodic backup 2. Perform point-in-time restore - DevOps and automation 1. Deploy via ARM, Bicep, CLI 2. Automate operations - Manage data movement 1. Migrate between APIs or regions 2. Import/export data - Implement security 1. Manage authentication and authorization 2. Encrypt data at rest and in transit - Monitor and troubleshoot 1. Use Azure Monitor and Application Insights 2. Analyze metrics and logs
Design and implement data models	35-40%	- Implement connectivity and data access 1. Use SDKs to connect and operate 2. Write efficient SQL queries - Design and implement non-relational data models 1. Embed related entities in documents 2. Define primary and unique keys 3. Reference between documents 4. Store multiple entity types in one container 5. Configure time-to-live (TTL) 6. Denormalize data across documents 7. Identify data and access patterns - Plan sizing and scaling 1. Provision throughput and storage 2. Select consistency levels - Design partitioning strategy 1. Plan for distribution and throughput 2. Choose partition key based on workload
Integrate an Azure Cosmos DB solution	5-10%	- Integrate with Azure services 1. Connect to Azure Stream Analytics 2. Use with Azure Functions, Logic Apps, Event Hubs - Enable analytical workloads 1. Configure analytical store 2. Use Synapse Link

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Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB Sample Questions (Q138-Q143):

NEW QUESTION # 138
You maintain a relational database for a book publisher. The database contains the following tables.

The most common query lists the books for a given authorId.
You need to develop a non-relational data model for Azure Cosmos DB Core (SQL) API that will replace the relational database. The solution must minimize latency and read operation costs.
What should you include in the solution?

A. Create a container that contains a document for each Author and a document for each Book. In each Book document, embed authorId.
B. Create Author, Book, and Bookauthorlnk documents in the same container.
C. Create a container for Author and a container for Book. In each Author document and Book document embed the data from Bookauthorlnk.
D. Create a container for Author and a container for Book. In each Author document, embed booked for each book by the author. In each Book document embed author of each author.

Answer: D

Explanation:
Explanation
Store multiple entity types in the same container.

NEW QUESTION # 139
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. all the properties of the original items and the updated items
B. only the partition key and the changed properties of 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 # 140
You plan to create an Azure Cosmos DB container named account that will contain items in the following format.

You need to define a query that will return the ids of all accounts that have ever recorded a negative value for balance.
How should you complete the query? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

Answer:

Explanation:

Explanation:

NEW QUESTION # 141
Hotspot Question
You have the Azure Cosmos DB for NoSQL containers shown in the following table.

You have the items shown in the following table.

When will each item expire? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

Answer:

Explanation:

Explanation:
https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/time-to-live

NEW QUESTION # 142
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 Data Factory pipeline that uses Azure Cosmos DB Core (SQL) API as the input and Azure Blob Storage as the output.
Does this meet the goal?

A. No
B. Yes

Answer: A

Explanation:
Instead create an Azure function that uses Azure Cosmos DB Core (SQL) API change feed as a trigger and Azure event hub as the output.
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:

NEW QUESTION # 143
......

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