Modern disks often have their own main memory caches, typically about 1 MB, and use this to prefetch pages. The rationale for this technique is the em- pirical observation that, if a disk page is requested by some (not necessarily database!) application, 80% of the time the next page is requested as well. So the disk gambles by reading ahead. 1. Give a nontechnical reason that a DBMS may not want to rely on prefetching controlled by the disk. 2. Explain the impact on the disk's cache of several queries running concurrently, each scanning a different file. 3. Is this problem addressed by the DBMS buffer manager prefetching pages? Ex- plain.

Modern disks often have their own main memory caches, typically about 1 MB, and use this to prefetch pages. The rationale for this technique is the em- pirical observation that, if a disk page is requested by some (not necessarily database!) application, 80% of the time the next page is requested as well. So the disk gambles by reading ahead. 1. Give a nontechnical reason that a DBMS may not want to rely on prefetching controlled by the disk. 2. Explain the impact on the disk's cache of several queries running concurrently, each scanning a different file. 3. Is this problem addressed by the DBMS buffer manager prefetching pages? Ex- plain.

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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Question

Modern disks often have their own main memory caches, typically
about 1 MB, and use this to prefetch pages. The rationale for this technique is the em-
pirical observation that, if a disk page is requested by some (not necessarily database!)
application, 80% of the time the next page is requested as well. So the disk gambles
by reading ahead.
1. Give a nontechnical reason that a DBMS may not want to rely on prefetching
controlled by the disk.
2. Explain the impact on the disk's cache of several queries running concurrently,
each scanning a different file.
3. Is this problem addressed by the DBMS buffer manager prefetching pages? Ex-
plain.

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