DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 19, Problem 20E
Explanation of Solution
Using logical undo logging widely:
- Logical operations refer to the class of operations that releases lock early.
- After these lower level locks are released, these operations cannot be performed by simply using the older values of modified data items.
- Logical undo operations are used to undo them.
- These exists a compensatory undo operation for each logical operation.
- In order to allow logical undo operations, special log records are needed.
- They store the required logical undo information.
- Therefore, logical undo logging is used widely...
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Chapter 19 Solutions
DATABASE SYSTEM CONCEPTS LCPO
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