Exam AZ-204 topic 3 question 28 discussion

The goal is "You need to update the application to support multi-region writes", that is enable multi-region writes (bool, option C) and add the regions (option A) Then you have to apply the Conflict resolution policies.This can be LLW(default, not mentioned) or custom (option D). Hence : there is only ONE way to to support multi-region writes (both apply C AND A) and there are subsequently TWO ways to apply the Conflict resolution policies (@ SQL) to solve write, update and delete conflicts of which one is mentioned in the question (D). To support multi-region writes I would answer A and C , but they have to be set both, not one or the other. See https://learn.microsoft.com/en-us/azure/cosmos-db/sql/how-to-multi-master?tabs=api-async and https://learn.microsoft.com/en-us/azure/cosmos-db/conflict-resolution-policies

A + C = Clearly stated in documentation that both are required: https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/how-to-multi-master?tabs=api-async. And according to the question "Each correct answer presents part of the solution". "Part" Not D -> "Custom conflict resolution policy is available only for API for NoSQL accounts and can be set only at creation time." The question states the account was already created. Source: https://learn.microsoft.com/en-us/azure/cosmos-db/conflict-resolution-policies

D is not answer, Conflict resolution policy can only be specified at container creation time and cannot be modified after container creation, however the question mentions that "You need to update the application to support multi-region writes.", so we suppose that the containter has been created before we update ConnectionPolicy, so D is not applicable. The answer is C+A, set UseMultipleWriteLocation and PreferredLocation.

C. Setting the UseMultipleWriteLocations property to true allows the Cosmos DB SDK to automatically route write operations to the closest available write region, improving write latency. This is a key configuration for enabling multi-region writes. D - is relevant in scenarios where conflict resolution needs customization,

got this question today, answer A,C - 7/30/2023, score 895/1000

Got this on 6/28/2023 and passed with 850. Went with A, C.

A&C to support multi-region writes

A & C https://learn.microsoft.com/en-us/azure/cosmos-db/sql/how-to-multi-master?tabs=api-async

A,C chat gpt

A&C ConnectionPolicy, set UseMultipleWriteLocations to true and pass the name of the region where the application is deployed to ApplicationRegion. This will populate the PreferredLocations property based on the geo-proximity from location passed in https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/how-to-multi-master?tabs=api-async

Answer should be CD The questions mentions .NET web application and if you check below link you can see for .net the option C goes And for multi write scenarios conflict might arise and hence option D https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/how-to-multi-master?tabs=api-async

AC are the correct answers as per microsoft docs https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/how-to-multi-master?tabs=api-async

Option C: Update the ConnectionPolicy class for the Cosmos client and set the UseMultipleWriteLocations property to true. This will enable the application to use multiple write regions when storing data in Azure Cosmos DB. Option A: Update the ConnectionPolicy class for the Cosmos client and populate the PreferredLocations property based on the geo-proximity of the application. This will allow the application to use the closest write region to the application's location, improving performance and reducing latency. Other options, such as updating the consistency level or creating a custom conflict resolution policy, are not directly related to enabling multi-region writes and are not necessary for this goal.

As stated by others

Correct answers should be A and C ConnectionPolicy policy = new ConnectionPolicy { ConnectionMode = ConnectionMode.Direct, ConnectionProtocol = Protocol.Tcp, UseMultipleWriteLocations = true ----> C }; policy.SetCurrentLocation("West US 2"); -----> A

C and D are the correct answers?

The documentation says: " To enable multi-region writes in your application, set ApplicationRegion to the region in which the application is being deployed and where Cosmos DB is replicated" Now the option to use that property is in .Net SDK V2. Microsoft says I do not need to know .Net for this exam and they ask questions from V2? So, I should try this in both v2 and v3 to be able to pass this exam.