A global retail company wants to migrate its legacy databases to Google Cloud. The databases consist of sales data, inventory, and customer profiles. The company wants a service that can automatically handle sharding and is globally distributed for high availability. Which Google Cloud service should they use?
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Correct answer: Cloud Spanner.
Why this is the answer
*Explanation:* To meet the requirements of automatic sharding and global distribution for high availability in migrating legacy databases, the best choice is **Cloud Spanner**. Cloud Spanner is a globally distributed, horizontally scalable, and fully managed database service that supports automatic sharding, making it suitable for complex and high-performance use cases like this one. Cloud SQL (Option B. would require manual sharding and is not natively globally distributed. Cloud Bigtable (Option C. is designed for NoSQL workloads and may not fit the relational data structure of the legacy databases. Firestore (Option D) is more suitable for document-based data and might not meet the performance and transactional requirements. Cloud MemoryStore (Option E) is an in-memory cache and not intended for database migration.
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