DATABASE SYSTEM CONCEPTS LCPO
DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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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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