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 24E
Explanation of Solution
Comparison of log-based recovery with the shadow-copy scheme in terms of their overheads:
- In log-based recovery, a log is created in stable storage for each transaction.
- Whereas in shadow-copy scheme, a transaction is performed on the local copy of the
database . - With log-based recovery, each update in database is written twice as follows:
- Once as a part of the page to which it is written.
- Once as a part of the log record for the update.
- While shadow copying does not involve in log writes. But here, I/O operations are increased and concurrency decreases when it comes to the data that is added for the first time to a newly allocated disk page...
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