An Introduction to the Progress Database - Radius
An Introduction to the Progress Database - Radius
An Introduction to the Progress Database - Radius
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<strong>Database</strong> S<strong>to</strong>rage<br />
Physical View<br />
• Block: A fixed-size unit of disk I/O and s<strong>to</strong>rage. All<br />
data areas have same block size.<br />
• Extent: A unit of disk s<strong>to</strong>rage<br />
• Ei<strong>the</strong>r a file or a raw disk slice<br />
• May be fixed or variable size<br />
• Area: A group of physical s<strong>to</strong>rage objects<br />
8<br />
© 2007 <strong>Progress</strong> Software Corporation
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