The shadow-paging scheme requires the page table to be copied. Suppose the page table is represented as a B+-tree. A. Suggest how to share as many nodes as possible between the new copy and the shadow-copy of the B-tree, assuming that updates are made only to leaf entries, with no insertions and deletions. B. Even with the above optimization, logging is much cheaper than a shadow-copy scheme, for transactions that perform small updates. Explain why.
The shadow-paging scheme requires the page table to be copied. Suppose the page table is represented as a B+-tree. A. Suggest how to share as many nodes as possible between the new copy and the shadow-copy of the B-tree, assuming that updates are made only to leaf entries, with no insertions and deletions. B. Even with the above optimization, logging is much cheaper than a shadow-copy scheme, for transactions that perform small updates. Explain why.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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![The shadow-paging scheme requires the page table to be copied. Suppose the page table is represented
as a B+-tree.
A. Suggest how to share as many nodes as possible between the new copy and the shadow-copy of
the B-tree, assuming that updates are made only to leaf entries, with no insertions and deletions.
B. Even with the above optimization, logging is much cheaper than a shadow-copy scheme, for
transactions that perform small updates. Explain why.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe418e354-12bc-46ea-a349-32476f5dd10b%2F2f036f7d-b450-4d6a-9d54-b91ceeb50bfd%2F2j4m3ip_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The shadow-paging scheme requires the page table to be copied. Suppose the page table is represented
as a B+-tree.
A. Suggest how to share as many nodes as possible between the new copy and the shadow-copy of
the B-tree, assuming that updates are made only to leaf entries, with no insertions and deletions.
B. Even with the above optimization, logging is much cheaper than a shadow-copy scheme, for
transactions that perform small updates. Explain why.
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