Question: With Cloud Spanner, if one region goes offline, data can still be served from another region. How does Cloud Spanner make this possible?
- Cloud Spanner captures up to a petabyte of data on one Transfer Appliance without impacting the outbound network.
- Cloud Spanner stores and serves an unlimited number of objects and up to 5 terabytes of object data for each.
- Cloud Spanner automates loading data into BigQuery from YouTube, AdWords, and DoubleClick.
- Cloud Spanner uses synchronous replication within and across regions to achieve greater availability.
Explanation
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.
Why the other options are incorrect
Transfer Appliance is for offline data transfer, not database availability.
Cloud Storage object data describes object storage limits, not Cloud Spanner replication.
BigQuery Data Transfer Service moves data into BigQuery, not Cloud Spanner.
Source for verification
https://cloud.google.com/spanner/docs/replication
https://cloud.google.com/spanner/docs/overview
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