Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Expert Solution & Answer
Chapter 19, Problem 22E
Explanation of Solution
a.
Recovery
- Consider a transaction, which was running for a long time, performing very few updates.
- During recovery, the undo phase for the transaction will end up scanning the long logs backward.
- Thus, the recovery time increases with the algorithm given in the figure 16...
Explanation of Solution
b.
Deletion of old log records:
- Once a transaction starts, its log records cannot be deleted till it either commits or aborts...
Expert Solution & Answer
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