Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You are designing a new Azure data platform for a global e-commerce company. The platform must store two types of data produced by the storefront: JSON-formatted shopping cart events (up to 40 000 writes/sec) and product images (average object size 2 MB). The solution must meet the following requirements:
Provide at least 99.999 percent read availability even during a regional outage.
Offer automatic failover without application code changes.
Minimize ongoing administrative effort. Which Azure service configuration should you recommend?
Deploy Azure SQL Database in an active-geo replication failover group and store images in zone-redundant blob storage.
Create an Azure Cosmos DB account configured for multiple write regions and enable automatic failover.
Store JSON events in an Azure Storage account using RA-GZRS and store images in a separate RA-GZRS account.
Use a single-region Azure Storage account configured for GRS and enable Azure Traffic Manager for endpoint failover.
An Azure Cosmos DB account deployed with multi-region writes automatically replicates data to any number of Azure regions and offers a financially backed 99.999 percent read availability SLA. Because the account endpoint is a global endpoint that abstracts all configured regions, an application continues to read and write without code changes when Microsoft initiates regional failover, satisfying the automatic failover requirement with virtually no operational overhead.
Azure Storage with either GRS or RA-GZRS provides only 99.99 percent read availability and requires the client to target a secondary read-only endpoint, so it cannot guarantee 99.999 percent availability without code modifications. Azure SQL Database failover groups are designed for relational data, not large-scale semi-structured JSON and unstructured binary objects, and they also offer a 99.99 percent availability SLA. Therefore, the Cosmos DB multi-region write configuration is the only option that fully meets all requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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