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1
Consistency is a term which relates to reads only. All write operations are atomic and will appear in the order they are received, so yes, if you call DeleteItem after a PutItem then it is guaranteed to be deleted.
However, if you call DeleteItem and then PutItem, the item will be there as the PutItem was the last called event. You can add logic to your PutItem with a ConditionExpression to only write if it does not already exist.
0
Nice question....I can't find any specific documentation but a DeleteItem (as well as PutItem) operation would be considered a write operation and according to docs - "When your application writes data to a DynamoDB table and receives an HTTP 200 response (OK), the write has occurred and is durable".
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I don't think that "durable" is the property that I need here. Remember the database "ACID" properties. C = consistent, D = durable. They're different things.