With Cloud Spanner, if one region goes offline, data can still be served from another region. How does Cloud Spanner make this possible?
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Correct answer: Cloud Spanner uses synchronous replication within and across regions to achieve greater availability..
Why this is the answer
Cloud Spanner is built for high availability by maintaining replicated data across zones and, in multi-region configurations, across regions. Synchronous replication helps keep committed data consistent across replicas before transactions complete. This allows applications to continue serving data from another available location when a regional failure occurs. The value is resilient relational database service without requiring custom replication infrastructure.
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