Suppose that the system crashes before the [read_item, T 3 , A] entry is written to the
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Suppose that the system crashes before the [read_item, T3, A] entry is written to the log in Figure 22.1(b). Will that make any difference in the recovery process?
Figure 22.1(b)
Transcribed Image Text:
(b) A BCD 30 15 40 20 [start_transaction, T3] [read_item, T3,C] [write_item, T3.B,15,12] [start_transaction, T2) 12 [read_item, T2,B] [write_item, T2,B,12,18] 18 [start_transaction, T;] [read_item, TA] [read_item, T,D] [write_item,T,D,20,25] 25 [read_item, T2, D] [write_item, T2,D,25,26] 26 [read_item, T3 A] System crash
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Related Book For
Fundamentals Of Database Systems
ISBN: 9780133970777
7th Edition
Authors: Ramez Elmasri, Shamkant Navathe
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