Reference:
https://docs.microsoft.com/en-us/azure/architecture/data-guide/relational-data/etl

Reference:
https://azure.microsoft.com/en-us/services/cognitive-services/speech-services/

Isolation. See course material:
o concurrent transactions cannot interfere with one another, and must result in a consistent database state.
o For example, while the transaction to transfer funds from one account to another is in-process, anoth er transaction that checks the balance of these accounts must return consistent results - the balance- checking transaction can ' t retrieve a value for one account that reflects the balance before the transfer, and a value for the other account that reflects the balance after the transfer.