AWS Certified Solutions Architect Associate SAA-C03 Practice Question
Which Amazon relational database feature uses storage-based, sub-second replication to automatically copy data to secondary clusters in up to 10 additional AWS Regions, providing low-latency reads for read-heavy workloads and fast cross-Region failover?
Amazon Aurora Global Database spans multiple AWS Regions by replicating changes from the primary cluster to up to 10 secondary clusters using dedicated storage-layer replication, typically in under 1 second. Each secondary Region can host up to 16 read-only instances, making it ideal for read-heavy global applications and for disaster recovery with a Region-wide RTO of <1 minute.
Amazon RDS cross-Region read replicas replicate asynchronously and may have seconds-to-minutes of lag; they scale reads in a single secondary Region at a time and require manual promotion for failover.
Amazon RDS Multi-AZ keeps a synchronous standby only inside the same Region, so it does not meet the multi-Region requirement.
Amazon Redshift cross-Region snapshots copy backups to another Region for restore purposes; they do not provide live read access.
Therefore, Amazon Aurora Global Database is the only option that automatically maintains current, low-latency read copies in multiple AWS Regions.
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