The following are some scenarios of database failures. Identify the type of failure, probable outcome, and how it can be resolved: • Payment of $500.00 • Purchase on credit of $100.00 • Merchandise return (credit) of $50.00 Each of the three transactions read the customer record when the balance was $500.00 (i.e., before any of the other transactions were completed). The updated customer record was returned to the database in the order shown in the bulleted list above. a. An airlines had to cancel all their flights since the application that was handling crew assignments crashed. This happened because of bad weather, which resulted in alarmingly high reassignments? b. In an online order management system, a transaction has locked some rows in the table Accounts and needs to update another table Orders to complete the transaction. Another transaction B has locked the same rows (required for updating by transaction A) in the table Order and needs to update the table Accounts to finish the transaction. c. A bank sends a SMS to its customers for each debit/ credit transaction occurring through ATMs. Recently it has noted that the system is sending vague messages, such as a debit transaction message when no debit has been made, or another stating the withdrawn amount less than what was actually drawn
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