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Google Cloud Certified Professional Data Engineer · Google Cloud
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SQL is always the best option for Transactional database. Besides it is good in vertical auto-scaling.
You don't need to go far, guys. Cloud SQL does not support auto scale; cut the shit here based on the requirement—the question specifically says "you do not want to manage infrastructure scaling."
POS app needing scalable DB without managing infrastructure. Cloud Datastore or Firestore? But options are Cloud SQL, BigQuery, Bigtable, Datastore. Since it's for transactions and scale, maybe Cloud Datastore (D) or Cloud Bigtable. But Cloud Bigtable is for high throughput. The question says not to manage scaling. Cloud Datastore is serverless. So D.