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Yes that’s been discredited repeatedly by Amazon executives. Stories pop up all of the time from Amazon where they talk about moving part of thier infrastructure to AWS - including the migration from Oracle to AWS native solutions.

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Yes, Amazon is trying to move off of Oracle but they still use a lot of them [0]. Also, most of their retail stack runs outside of AWS which is why they could not scale up during prime day because they completely depended on their non-AWS nosql database sable [1].

[0]: https://www.zdnet.com/article/amazon-salesforce-would-love-t...

[1]: https://www.cnbc.com/2018/07/19/amazon-internal-documents-wh...

I don’t know the origin story, but that doesn’t discredit anything. Lots of Amazon teams predate AWS, and so does some of their technology. You wouldn’t make a new service and then drop absolutely everything across a huge company to force migration to it. Teams at Amazon have a lot of flexibility in how they build.

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