1 There are two transactions T1 and T2, and they are executed concurrently, as shown in the following figure: TI T2 Read (X) x=x-5 Read (X) x=x+5 Write (X) Write (X) COMMIT Question: Does the above schedule results in lost updates, dirty read, or both? 2. There are two transactions T1 and T2, and they are executed concurrently, as shown in the following figure: T1 T2 Read (X) x=x-5 Write (X) Read (X) x=x+5 Write (X) ROLLBACK COMMIT Question: Does the above schedule results in lost updates, dirty read, or both