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 6PE
Program Plan Intro
Shadow-paging scheme:
Shadow-paging is a variation of shadow-copying scheme which introduces a page table that includes a pointer to all pages. Here, a copy of both the updated pages and the page table is made to the new location.
Explanation of Solution
b.
Logging being cheaper than a shadow-copy scheme:
For transactions performing small updates, logging is cheaper because of the following reasons:
- Even with the given optimization, shadow paging ends up copying multiple pages even for single updates.
- However, logging needs creation of small records for each update...
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