February 2011
Intermediate to advanced
352 pages
7h 59m
English
book
Database Modeling and Design, 5th Edition
by Toby J. Teorey, Sam S. Lightstone, Tom Nadeau, H.V. Jagadish
Content preview from Database Modeling and Design, 5th Edition
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A
A Simple Performance Model for Databases
Performance is your reality. Forget everything else.
—Harold Geneen
This appendix presents a simple performance cost model for evaluating physical design methods and tradeoffs among various designs. The model includes estimations for input/output (I/O) time and network delays.
A.1 I/O Time Cost—Individual Block Access
A block (or page) has been traditionally the basic unit of I/O from disk to fast memory (RAM). It can range in size from 2 to 16 KB, although 4,096 bytes (4 KB) is the most typical size in many systems. Blocks usually include many rows in a table, but occasionally a large row can span several blocks. In recent years, prefetch buffers have been used more often in operational systems to ...
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