Following figure 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 checkpointing. 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.
Following figure 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 checkpointing. 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.
Computer Networking: A Top-Down Approach (7th Edition)
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![9. (a) Following figure 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 checkpointing. 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.
3
[start_transaction, T,]
[read_item, T,, A]
[read_item, T,, D]
[write_item, T,, D, 20, 25]
[commit, T,]
[checkpoint]
[start_transaction, T,]
[read_item, T2, B]
[write_item, T2, B, 12, 18]
[start_transaction, T)
[read_item, T4, D]
[write_item, T4, D, 25, 15]
[start_transaction, T]
[write_item, T3, C, 30, 40]
[read_item, T4, A]
[write_item, T4, A, 30, 20]
[commit, T,)
[read_item, T2, D]
[write_item, T2, D, 15, 25]
System crash
5](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0dfe68d8-a93a-4eb3-958a-7ab777ed013a%2F619d442e-613d-4858-8515-021532e0cee5%2Fhdptuv5_processed.jpeg&w=3840&q=75)
Transcribed Image Text:9. (a) Following figure 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 checkpointing. 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.
3
[start_transaction, T,]
[read_item, T,, A]
[read_item, T,, D]
[write_item, T,, D, 20, 25]
[commit, T,]
[checkpoint]
[start_transaction, T,]
[read_item, T2, B]
[write_item, T2, B, 12, 18]
[start_transaction, T)
[read_item, T4, D]
[write_item, T4, D, 25, 15]
[start_transaction, T]
[write_item, T3, C, 30, 40]
[read_item, T4, A]
[write_item, T4, A, 30, 20]
[commit, T,)
[read_item, T2, D]
[write_item, T2, D, 15, 25]
System crash
5
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