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There are still 10 seats left for a enncert. Ticket agent A reads the number of available
seats and makes a reservation of 6 seats for a customer. At the same time ticket agent B, in another office, reads the available seats and makes a reservation of 5 seats for
another customer. (a) Use this example to explain how the lost update problem may occur when
transactions are processed concurrently. (b) Use the same example to explain how the two-phase locking (TPL) protocol
can be used to prevent the lost update problem. (6 marks)

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