You need a highly available, globally scalable data store for high-volume transaction writes and SQL analytics. Which multiregional service should you use?
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Correct answer: Create a multi-region Cloud Spanner instance with an optimized schema..
Why this is the answer
Cloud Spanner is the best choice because it's a globally distributed, strongly consistent relational database designed for high-volume transactional workloads and SQL analytics. Its multi-region configuration provides high availability and global scalability. An optimized schema is crucial for performance. Firestore is a NoSQL document database, not ideal for complex SQL analytics or strong transactional consistency across regions. Cloud SQL for PostgreSQL is a regional relational database, not inherently globally scalable or multi-region for active-active writes. BigQuery is an analytical data warehouse, excellent for SQL analytics but not designed for high-volume transactional writes.
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