ATM Transaction Example

Because it involves getting customer account details, checking the balance, modifying the balance by the amount withdrawn, and commanding the ATM to deliver cash - all of which must be completed as a unit before the database is changed

Explanation

A cash withdrawal involves: getting customer account details, checking the balance, modifying the balance by the withdrawal amount, and sending commands to deliver cash. Until all of these steps are completed, the transaction is incomplete and the customer accounts database is not changed. This is the definition of an atomic transaction - all steps succeed or none do.