Figure 22.6 shows the log corresponding to a particular schedule at the point of a system crash
Question:
Figure 22.6 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 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.
Figure 22.6
Transcribed Image Text:
[start_transaction, T;] [read_item, T,, A] [read_item, T,, D] [write_item, T,, D, 20, 25] [commit, T,] [checkpoint] [start_transaction, T3] [read_item, T2, B] [write_item, T2, B, 12, 18] [start_transaction, Ta] [read_item, T4, D] [write_item, T4, D, 25, 15] [start_transaction, T3] [write_item, T3, C, 30, 40] [read_item, T4, Al] [write_item, T4, A, 30, 20] [commit, T4) [read_item, T2, D] [write_item, T2, D, 15, 25] System crash
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In this example Transactions T1 T4 are committed transactions Transactions T2 T3 are uncommitted ...View the full answer
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Related Book For
Fundamentals Of Database Systems
ISBN: 9780133970777
7th Edition
Authors: Ramez Elmasri, Shamkant Navathe
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