I wasn't saying banks should use Dynamo, but that Dynamo-style consistency is appropriate for conducting e-commerce transactions, and originally that most scaled industries don't depend on ACID semantics in their core datastores.
Bank accounts are eventually consistent logs, which doesn't look like Dynamo, but also look nothing like an RDBMS table. It's well known and understood that almost all banking systems are based around mainframe-era batch-process systems that are eventually consistent in nature. It's awfully ironic that the "hello world" used to demonstrate transactions in the RDBMS world is a debit and credit of bank accounts, a situation that is vanishingly rare in the real world.
Also, please address my original rebuttal to your claim that Amazon uses an ACID database for their checkout process.
Bank accounts are eventually consistent logs, which doesn't look like Dynamo, but also look nothing like an RDBMS table. It's well known and understood that almost all banking systems are based around mainframe-era batch-process systems that are eventually consistent in nature. It's awfully ironic that the "hello world" used to demonstrate transactions in the RDBMS world is a debit and credit of bank accounts, a situation that is vanishingly rare in the real world.
Also, please address my original rebuttal to your claim that Amazon uses an ACID database for their checkout process.