Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
A retailer stores 5 TB of semi-structured catalog data in JSON format and serves it to web and mobile apps worldwide. The solution must provide the following:
99.999 percent read and write availability
Automatic regional failover in less than one minute if a region is unavailable
Recovery point objective (RPO) of under five seconds during regional outages
Ability to accept writes from any region
Which Azure data-platform configuration meets these requirements with the least administrative effort?
Store the data in an Azure Storage account configured for read-access geo-zone-redundant storage (RA-GZRS).
Deploy Azure Cosmos DB in two regions with a single write region and automatic failover.
Deploy Azure Cosmos DB across multiple Azure regions with multi-region writes enabled and session consistency.
Store the data in an Azure SQL Database Hyperscale instance and configure active geo-replication to a secondary region.
Azure Cosmos DB distributed across multiple regions with multi-region (multi-write) enabled is the only Azure data service that meets all stated objectives. The SLA guarantees 99.999 percent availability for both reads and writes and automatic regional failover in under 60 seconds. Cross-regional replication latency is typically under five seconds, satisfying the RPO requirement. A single-write Cosmos DB account delivers only 99.99 percent write availability. Azure Storage RA-GZRS offers eventual consistency and no defined RPO. Azure SQL Database active geo-replication provides 99.99 percent availability and an RPO typically under five seconds, but it does not reach the required 99.999 percent availability, making it unsuitable.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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