Reverse Faulty DynamoDB Write Operations

Answer: B.

Option A is incorrect because DynamoDB supports atomic transactions.

Option B is CORRECT because DynamoDB transactions provide the ability to group multiple items into a single atomic transaction and perform all-or-nothing operation coordinated operations.This can be done programmatically using the TranactWriteItems operation.

Option C is incorrect because the BatchWriteItem operation does not guarantee that the actions will be performed on all items as a single atomic coordinated operation.

It is possible that only some of the actions in the batch succeed while the others do not.

Option D is incorrect because this is not the ideal solution.

It requires an application code change, and tracking all connected operations and reverse them as required is difficult to implement.

Using the native transaction ability provided by DynamoDB is a better option.

Reference:

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transaction-apis.html

The best method to accomplish the requirement of performing a write operation on a sequence of items, and roll back and reverse all operations in case of any faulty operation while using DynamoDB tables is to use the TransactWriteItems operation.

Option A is incorrect because although DynamoDB does not support atomic transactions natively, the TransactWriteItems operation provides transactional capability to write, delete or update multiple items across multiple tables as a single all-or-nothing operation.

Option B is the correct answer as it allows the application to group multiple write operations into a single atomic transaction, meaning all the write operations are executed or none of them are, and the transaction can be rolled back if any operation fails. This helps ensure data consistency and integrity.

Option C, BatchWriteItem operation, allows for a batch of up to 25 write operations to be executed in a single request, but it does not provide transactional capabilities like the TransactWriteItems operation.

Option D, updating the application to manage and perform rollback operations, may be possible, but it is not the best option as it requires a lot of work and may not be as reliable as using the built-in transactional capability of DynamoDB.

In conclusion, the best method to accomplish the requirement of performing a write operation on a sequence of items, and roll back and reverse all operations in case of any faulty operation while using DynamoDB tables is to use the TransactWriteItems operation.