Home » Microsoft » AZ-304 v.2 » Which consistency level should you recommend?
You are designing an Azure Cosmos DB solution that will host multiple writable replicas in multiple Azure regions.
You need to recommend the strongest database consistency level for the design. The solution must meet the following requirements:
Provide a latency-based Service Level Agreement (SLA) for writes.
Support multiple regions.
Which consistency level should you recommend?
A. bounded staleness
B. strong
C. session
D. consistent prefix
Correct Answer: A
Explanation/Reference:
Explanation:
Each level provides availability and performance tradeoffs. The following image shows the different consistency levels as a spectrum.
Note: The service offers comprehensive 99.99% SLAs which covers the guarantees for throughput, consistency, availability and latency for the Azure Cosmos DB Database Accounts scoped to a single Azure region configured with any of the five Consistency Levels or Database Accounts spanning multiple Azure regions, configured with any of the four relaxed Consistency Levels.
Incorrect Answers:
B: Strong consistency for accounts with regions spanning more than 5000 miles (8000 kilometers) is blocked by default due to high write latency. To enable this capability please contact support.
Reference:
https://azure.microsoft.com/en-us/support/legal/sla/cosmos-db/v1_3/
https://docs.microsoft.com/en-us/azure/cosmos-db/consistency-levels#consistency-levels-and-latency
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