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Microsoft DP-420 Exam Syllabus Topics:

SectionWeightObjectives
Maintain an Azure Cosmos DB solution25-30%- Monitor and troubleshoot Azure Cosmos DB solutions
  • 1. Troubleshoot throughput issues
  • 2. Monitor metrics and logs
  • 3. Implement backup and recovery strategies
  • 4. Monitor performance and availability
Design and implement data distribution5-10%- Design and implement multi-region writes
  • 1. Choose when to use multi-region writes
  • 2. Implement multi-region writes
  • 3. Implement conflict resolution policies
- Design and implement replication strategy
  • 1. Evaluate consistency model impacts
  • 2. Choose a consistency model
  • 3. Choose when to distribute data
  • 4. Perform manual failovers
  • 5. Define automatic failover policies
Design and implement data models35-40%- Design a data partitioning strategy
  • 1. Evaluate throughput and data distribution
  • 2. Plan for transactions with partition keys
  • 3. Choose a partition key
  • 4. Choose a partitioning strategy
  • 5. Evaluate cross-partition query cost
  • 6. Implement synthetic partition keys
- Implement data access
  • 1. Implement optimistic concurrency control
  • 2. Implement SQL queries with arrays and aggregation
  • 3. Use SDKs for CRUD operations
  • 4. Manage transactional batch operations
  • 5. Implement patch operations
  • 6. Use consistency and query request options
- Design and implement a non-relational data model for Azure Cosmos DB for NoSQL
  • 1. Store multiple entity types in the same container
  • 2. Identify partition key, id, and unique keys
  • 3. Reference between documents
  • 4. Denormalize data across documents
  • 5. Identify data and associated access patterns
  • 6. Store multiple related entities in the same document
- Implement server-side programming
  • 1. Implement user-defined functions
  • 2. Implement triggers
  • 3. Write and deploy stored procedures
- Plan and implement sizing and scaling
  • 1. Evaluate throughput and storage requirements
  • 2. Design resource governance and scaling
  • 3. Choose between serverless, provisioned, and free tier
  • 4. Configure throughput
  • 5. Evaluate global distribution costs
- Implement client connectivity options
  • 1. Choose gateway or direct connectivity mode
  • 2. Implement singleton client
  • 3. Configure client-side threading and logging
  • 4. Handle connection errors
  • 5. Create database connections
  • 6. Use Azure Cosmos DB emulator
Optimize an Azure Cosmos DB solution15-20%- Design and implement change feeds
  • 1. Implement aggregation persistence
  • 2. Consume change feeds using SDK
  • 3. Develop Azure Functions triggers
  • 4. Manage change feed instances
- Optimize query performance
  • 1. Implement integrated cache
  • 2. Calculate query cost
  • 3. Retrieve request unit cost
  • 4. Adjust indexing policies
- Define and implement indexing strategy
  • 1. Choose appropriate index types
  • 2. Configure custom indexing policies
  • 3. Choose read-heavy or write-heavy indexing
  • 4. Optimize index performance
  • 5. Implement composite indexes
Integrate an Azure Cosmos DB solution5-10%- Implement solutions across services
  • 1. Use Change Feed for denormalization
  • 2. Aggregate and archive data
  • 3. Enforce referential integrity
  • 4. Implement Azure AI Search integration
  • 5. Integrate Azure Functions and Event Hubs
- Enable analytical workloads
  • 1. Query analytical store from Synapse
  • 2. Write data back from Spark
  • 3. Enable analytical store
  • 4. Configure Azure Cosmos DB Mirroring

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Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB Sample Questions (Q182-Q187):

NEW QUESTION # 182
You are developing an application that will use an Azure Cosmos DB Core (SQL) API account as a data source.
You need to create a report that displays the top five most ordered fruits as shown in the following table.

A collection that contains aggregated data already exists. The following is a sample document:
{
"name": "apple",
"type": ["fruit", "exotic"],
"orders": 10000
}
Which two queries can you use to retrieve data for the report? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
A)

B)

C)

D)

Answer: A,B

Explanation:
ARRAY_CONTAINS returns a Boolean indicating whether the array contains the specified value. You can check for a partial or full match of an object by using a boolean expression within the command.
Incorrect Answers:
A: Default sorting ordering is Ascending. Must use Descending order.
C: Order on Orders not on Type.


NEW QUESTION # 183
The following is a sample of a document in orders.

The orders container uses customerId as the partition key.
You need to provide a report of the total items ordered per month by item type. The solution must meet the following requirements:
Ensure that the report can run as quickly as possible.
Minimize the consumption of request units (RUs).
What should you do?

Answer: D

Explanation:
Explanation
You can facilitate aggregate data by using Change Feed and Azure Functions, and then use it for reporting.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/change-feed


NEW QUESTION # 184
Case Study 1 - Litware, inc
Overview
Litware, Inc. is a United States-based grocery retailer. Litware has a main office and a primary datacenter in Seattle. The company has 50 retail stores across the United States and an emerging online presence. Each store connects directly to the internet. Existing environment.
Cloud and Data Service Environments. Litware has an Azure subscription that contains the resources shown in the following table.

Each container in productdb is configured for manual throughput. The con-product container stores the company's product catalog data. Each document in con-product includes a con- productvendor value. Most queries targeting the data in con-product are in the following format.
SELECT * FROM con-product p WHERE p.con-productVendor - 'name'
Most queries targeting the data in the con-productVendor container are in the following format SELECT * FROM con-productVendor pv ORDER BY pv.creditRating, pv.yearFounded Existing environment.
Current Problems.
Litware identifies the following issues:
- Updates to product categories in the con-productVendor container do not propagate automatically to documents in the con-product container.
- Application updates in con-product frequently cause HTTP status code 429 "Too many requests".
- You discover that the 429 status code relates to excessive request unit (RU) consumption during the updates.
Requirements.
Planned Changes
Litware plans to implement a new Azure Cosmos DB for NoSQL account named account2 that will contain a database named iotdb. The iotdb database will contain two containers named con- iot1 and con-iot2.
Litware plans to make the following changes:
- Store the telemetry data in account2.
- Configure account1 to support multiple read-write regions.
- Implement referential integrity for the con-product container.
- Use Azure Functions to send notifications about product updates to different recipients.
- Develop an app named App1 that will run from all locations and query the data in account1.
- Develop an app named App2 that will run from the retail stores and query the data in account2.
- App2 must be limited to a single DNS endpoint when accessing account2.
Requirements.
Business Requirements
Litware identifies the following business requirements:
- 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.
- Ensure that Azure Cosmos DB costs for IoT-related processing are predictable.
- Minimize the number of firewall changes in the retail stores.
Requirements.
Product Catalog Requirements
Litware identifies the following requirements for the product catalog:
- Implement a custom conflict resolution policy for the product catalog data.
- Minimize the frequency of errors during updates of the con-product container.
- Once multi-region writes are configured, maximize the performance of App1 queries against the data in account1.
- Trigger the execution of two Azure functions following every update to any document in the con- product container.
You need to provide a solution for the Azure Functions notifications following updates to con- product. The solution must meet the business requirements and the product catalog requirements.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

Answer: A,B

Explanation:
leaseCollectionPrefix: when set, the value is added as a prefix to the leases created in the Lease collection for this Function. Using a prefix allows two separate Azure Functions to share the same Lease collection by using different prefixes.
Scenario: Use Azure Functions to send notifications about product updates to different recipients.
Trigger the execution of two Azure functions following every update to any document in the con- product container.
Reference:
https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-cosmosdb-v2-trigger


NEW QUESTION # 185
You have an Azure Cosmos DB Core (SQL) API account that is used by 10 web apps.
You need to analyze the data stored in the account by using Apache Spark to create machine learning models. The solution must NOT affect the performance of the web apps.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

Answer: A,D

Explanation:
Reference:
https://github.com/microsoft/MCW-Cosmos-DB-Real-Time-Advanced-Analytics/blob/main/Hands-on%20lab/HOL%20step-by%20step%20-%20Cosmos%20DB%20real-time%20advanced%20analytics.md


NEW QUESTION # 186
You provision Azure resources by using the following Azure Resource Manager (ARM) template.

For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.

Answer:

Explanation:

Explanation:

Box 1: No
An alert is triggered when the DB key is regenerated, not when it is used.
Note: The az cosmosdb keys regenerate command regenerates an access key for a Azure Cosmos DB database account.
Box 2: No
Only an SMS action will be taken.
Emailreceivers is empty so no email action is taken.
Box 3: Yes
Yes, an alert is triggered when the DB key is regenerated.
Reference: https://docs.microsoft.com/en-us/cli/azure/cosmosdb/keys


NEW QUESTION # 187
......

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