Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 19, Problem 4PE
Explanation of Solution
Implementing savepoints and performing rollback to a savepoint:
- Transactions record a savepoint so that they can be rolled back partially till the savepoint, if required.
- In order to perform a savepoint,
- For each transaction that is currently in main memory, write all its log records to the stable storage.
- For a savepoint of a transaction say Ti, write a log-record of the form i> to the stable storage.
- Now, refer to the recovery
algorithm given in section 19.4. The following modifications are made to each phase of the algorithm:- Transaction rollback
- When a transaction that is currently in execution needs to be partially rolled back till a specified savepoint...
- Transaction rollback
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