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The Microsoft DP-420 Exam is intended for software developers, architects, and IT professionals who work with Azure Cosmos DB and want to validate their skills in designing and implementing cloud-native applications. Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB certification exam requires a strong understanding of Azure Cosmos DB, including its features, functionality, and best practices. Additionally, it tests a candidate's ability to design, implement, and optimize cloud-native applications using Azure Cosmos DB.
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Achieving the Microsoft DP-420 certification can open up new career opportunities for you as a cloud-native application developer or architect. It can help you demonstrate your expertise in designing and implementing scalable and highly available cloud-native applications using Cosmos DB, which is a critical component of the Microsoft Azure ecosystem. By passing DP-420 Exam, you can show potential employers that you have the skills and knowledge needed to develop and deploy cloud-native applications that meet the demands of modern businesses.
NEW QUESTION # 275
You have an Azure subscription that contains an Azure Cosmos DB for NoSQL account You need to write a SQL query that will return multiple items. The solution must meet the following requirements:
* For each item returned, include the current Coordinated Universal Time (UTC) date and time, formatted as an ISO 8601 string.
* Minimize development effort.
What should you use?
Answer: A
NEW QUESTION # 276
You have an Azure Cosmos DB for NoSQL account named account1.
In account1, you plan to create a container named container1 that will contain data continuously collected from self-driving cars. The items in container1 will be accessed mostly by using queries that target data collected from a specific car during a given day. Each car is identifiable by using a property named Vehicle-Identification-Number.
You need to identify a partition strategy for container1. The strategy must meet the following requirements:
- Maximize read and write performance.
- Minimize the costs of data reads and writes.
What should you identify?
Answer: B
Explanation:
For an Azure Cosmos DB for NoSQL container storing continuous self-driving car data, the optimal partition strategy is to use the requested synthetic partition key constructed by concatenating the current date and a hash of the Vehicle-Identification-Number (VIN).
Why this strategy is optimal:
Maximizes Read Performance:
Since your primary access pattern targets a specific car on a given day, this synthetic key ensures that all relevant data for that query resides in a single logical partition.
This allows the database to perform efficient in-partition queries rather than expensive and slow cross-partition scans.
Maximizes Write Performance:
Including a hash of the VIN ensures high cardinality, which prevents "hot partitions".
Even if many cars are reporting data simultaneously, the hash-based distribution spreads these writes across multiple physical partitions.
Minimizes Costs:
By avoiding cross-partition queries, you significantly reduce Request Unit (RU) consumption, as each physical partition scan adds overhead (typically 2-3 RUs per partition).
The 20-GB logical partition limit is less likely to be exceeded because data for a single car is scoped to a single day rather than its entire history.
Reference:
https://www.dclessons.com/azure-cosmos-db
NEW QUESTION # 277
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:
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.
Answer: A,C
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.
Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/sql/sql-query-array-contains
NEW QUESTION # 278
You have a database named db1 in an Azure Cosmos DB for NoSQL
You are designing an application that will use dbl.
In db1, you are creating a new container named coll1 that will store in coll1.
The following is a sample of a document that will be stored in coll1.
The application will have the following characteristics:
* New orders will be created frequently by different customers.
* Customers will often view their past order history.
You need to select the partition key value for coll1 to support the application. The solution must minimize costs.
To what should you set the partition key?
Answer: D
Explanation:
Based on the characteristics of the application and the provided document structure, the most suitable partition key value for coll1 in the given scenario would be the customerId, Option B.
The application frequently creates new orders by different customers and customers often view their past order history. Using customerId as the partition key would ensure that all orders associated with a particular customer are stored in the same partition. This enables efficient querying of past order history for a specific customer and reduces cross-partition queries, resulting in lower costs and improved performance.
a partition key is a JSON property (or path) within your documents that is used by Azure Cosmos DB to distribute data among multiple partitions3. A partition key should have a high cardinality, which means it should have many distinct values, such as hundreds or thousands1. A partition key should also align with the most common query patterns of your application, so that you can efficiently retrieve data by using the partition key value1.
Based on these criteria, one possible partition key that you could use for coll1 is B. customerId.
This partition key has the following advantages:
It has a high cardinality, as each customer will have a unique ID3.
It aligns with the query patterns of the application, as customers will often view their past order history3.
It minimizes costs, as it reduces the number of cross-partition queries and optimizes the storage and throughput utilization1.
This partition key also has some limitations, such as:
It may not be optimal for scenarios where orders need to be queried independently from customers or aggregated by date or other criteria3.
It may result in hot partitions or throttling if some customers create orders more frequently than others or have more data than others1.
It may not support transactions across multiple customers, as transactions are scoped to a single logical partition2.
Depending on your specific use case and requirements, you may need to adjust this partition key or choose a different one. For example, you could use a synthetic partition key that concatenates multiple properties of an item2, or you could use a partition key with a random or pre-calculated suffix to distribute the workload more evenly2.
NEW QUESTION # 279
You have an Azure Cosmos DB for NoSQL database named db1 that writes to multiple Azure regions.
You need to test the performance of db1 in the secondary region.
Which command should you run first?
Answer: C
Explanation:
To perform a manual failover in Azure Cosmos DB for NoSQL, use the 'az cosmosdb failover- priority-change' Azure CLI command with the -failover-policies option, changing the priority of the desired region to 0.
Note:
az cosmosdb failover-priority-change
Changes the failover priority for the Azure Cosmos DB database account.
Incorrect:
[Not A]
The Azure CLI command to show the properties of an Azure Cosmos DB location is az cosmosdb locations show.
[Not B]
az cosmosdb failover-priority-change
Changes the failover priority for the Azure Cosmos DB database account.
[Not D]
az cosmosdb network-rule remove
Remove a virtual network rule from an existing Cosmos DB database account.
Reference:
https://learn.microsoft.com/en-us/cli/azure/cosmosdb?view=azure-cli-latest#az-cosmosdb-failover-priority-change
NEW QUESTION # 280
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