July 2010
Intermediate to advanced
448 pages
12h 22m
English
Content preview from Physical Database Design
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197
11
Query Execution Plans
and Physical Design
It is a bad plan that admits of no modification.
—Publilius Syrus (~100
B.C.), Maxims
Make a new plan Stan … and get yourself free.
—Paul Simon
hroughout this book we’ve presented the major attributes of physical database
design, and how they are used and why. How can you determine if a specific data-
base design attribute is really helping or hurting your database? Or even more funda-
mentally, how can you determine if a design feature is being used by the database?
There’s a brute-force method of course: Run experiments with your application work-
load to evaluate the contributions of every single physical design change to determine
the impact. This kind of brute-force strategy is probably inefficient since ...
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