Here is the answer of the 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.
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