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AWS and the Amazon.com store may have synergy now, but for many years the store was its own thing. Amazon.com only finished migrating off Oracle DB in 2019:

https://aws.amazon.com/blogs/aws/migration-complete-amazons-...

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The last Oracle DB migration was just for one part of internal retail operation that was particularly difficult or just needed more resources. Most of retail had been using AWS for quite some time before that (earlier than 2009). Source: worked there and knew the team that did that migration.

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