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.

The correct answer is:

• Cloud Spanner uses synchronous replication within and across regions to achieve greater availability.

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Sources: Google Cloud Platform Business Professional Accreditation Certification Course

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