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Question 27 of 87
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Spanner decouples compute resources from data storage, which makes it possible to transparently scale in and out processing resources. Each additional compute capacity can process both reads and writes, providing effortless horizontal scalability. Spanner optimizes performance by automatically handling the sharding, replication, and transaction processing.
BigQuery for scalable, serverless, and cost-effective SQL-based analytics.
"transactional SQL queries against HISTORICAL data at scale" sounds more like data analytics on historical data than OLTP, I'm leaning towards BigQuery (A)