In the timestamp ordering (aka timestamp-based) concurrency control algorithm, explain why a new timestamp should be assigned to a transaction when it is rolled back and then resubmitted. You don't need to describe the timestamp ordering concurrency control algorithm, and don't need to show an example schedule. 4. (15 points) Convert the EER schema shown below to an equivalent 00 model using the Object Definition Language (ODL) of ODMG standard. Vin Price Model VEHICLE TRUCK SALE Sid Date SALESPERSON CAR Name San SUV CUSTOMER Engine size Name Tonnage No seats Address State City Street Figure 9.9 EER diagram for a car dealer