Specify which transactions are rolled back which operations, Basic Computer Science

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Specify which transactions are rolled back which operations

Figure 23.6 shows the log corresponding to a particular schedule at the point of a system crash for four transactions T1, T2, T3, and T4. Suppose that we use the immediate update protocol with check pointing. Describe the recovery process from the system crash. Specify which transactions are rolled back, which operations in the log are redone and which (if any) are undone, and whether any cascading rollback takes place.

237_96328191-7445-4eb6-8ae3-dcffc302b656 (1).png

Figure 23.6

A sample schedule and its corresponding log

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