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Google Cloud Certified Professional Data Engineer · Google Cloud
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Correct: C
Cloud Spanner is a fully-managed, horizontally scalable relational database service that supports transactions and allows you to optimize data for range queries on non-key columns. By using Cloud Spanner for storage, you can ensure that your database can scale horizontally to meet the needs of your application. To optimize data for range queries on non-key columns, you can add secondary indexes, this will allow you to perform range scans on non-key columns, which can improve the performance of queries that filter on non-key columns.
Cloud SQL does support replicas to increase availability. Why is that not considered horizontal scaling?