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DynamoDB (Transaction (ACID (Isolation Level (Serialize Serializable…

- - - - DynamoDB performs two underlying reads or writes of every item in a transaction
        
        One to prepare the transaction
        
        One to commit the transaction
    - - Serialize
        Serializable isolation ensures that the results of multiple concurrent operations are the same as if no operation begins until the previous one has finished.
        
        Principle
        
        Between any transactional operation and any standard write operation (PutItem, UpdateItem, or DeleteItem).
        
        Between any transactional operation and any standard read operation (GetItem).
        
        Between a TransactWriteItems operation and a TransactGetItems operation.
      - Read-Commited
        Read-committed isolation ensures that read operations always return committed values for an item.
        Read-committed isolation does not prevent modifications of the item immediately after the read operation.
        
        Principle
  - - - Action
        
        Put
        
        Update
        
        Delete
        
        ConditionCheck
      - Principle
        
        You cannot target the same item with multiple operations within the same transaction.
        
        Changes made with transactions are propagated to global secondary indexes (GSIs), DynamoDB streams, and backups eventually, after the transaction completes successfully.
        
        A client token is valid for 10 minutes after the request that uses it finishes. After 10 minutes, any request that uses the same client token is treated as a new request. You should not reuse the same client token for the same request after 10 minutes.
        
        If you repeat a request with the same client token within the 10-minute idempotency window but change some other request parameter, DynamoDB returns an IdempotentParameterMismatch exception.
        
        If an ongoing TransactWriteItems operation conflicts with a concurrent PutItem, UpdateItem, DeleteItem, or TransactGetItems request on one or more items in the TransactWriteItems operation, then the concurrent request fails with a TransactionCanceledException.
    - - Priciple
        
        If an ongoing TransactWriteItems operation conflicts with a concurrent PutItem, UpdateItem, DeleteItem, or TransactGetItems request on one or more items in the TransactWriteItems operation, then the concurrent request fails with a TransactionCanceledException.