In watching the video in this section it mentions three read options and two write options, the last of which in both cases is listed as ‘transactional’. What is meant by transactional read/writes in this context and how do they compare to the other options? In reads for example we have: eventually consistent, strongly consistent and then transactional … is the context here that transactional means it does not have any reliance on consistency or something?
Traditionally, a transaction is a sequence of writes. Imagine collecting a subtotal, calculating tax, reducing inventory. If one of these operations fails, you could leave your data in an awkward state. You would want a mechanism to "roll back" these operations.