Storing Data: Disks and File Organizations

10/18/99


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Table of Contents

Storing Data: Disks and File Organizations

Disks and Files

Why Not Store Everything in Main Memory?

Disks

Components of a Disk

Accessing a Disk Page

Arranging Pages on Disk

Disk Space Management

Buffer Management in a DBMS

When a Page is Requested ...

More on Buffer Management

Buffer Replacement Policy

DBMS vs. OS File System

Files of Records

Unordered (Heap) Files

Alternative File Organizations

Cost Model for Our Analysis

Assumptions in Our Analysis

Cost of Operations (I/O only)

Disk and File Summary

Disk and File Summary (Contd.)

Email: vandenbe@cs.washington.edu

Home Page: http://www.cs.washington.edu/education/courses/594/99au/

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