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Automated Physical Database Design and Tuning
book

Automated Physical Database Design and Tuning

by Nicolas Bruno
February 2011
Intermediate to advanced content levelIntermediate to advanced
253 pages
8h 4m
English
CRC Press
Content preview from Automated Physical Database Design and Tuning
Designing a Cost Model 87
Assuming that the optimizer returns the access path requests associated
with each index-based subtree in the query execution plan, we can transform
the relevant subplans by simply reimplementing each request based on the set
of available indexes. Consider a physical request ρ =N×(T, E, R, P, O, A) (see
Section 4.1.3), and suppose that we want to calculate the cost of an alternative
subplan that uses index I = T(c
1
,... ,c
n
) to implement ρ. In order to do so,
we can conceptually simulate the implementation rules in the optimizer that
produced ρ in the first place and can approximate what the optimizer would
have obtained under ...
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Publisher Resources

ISBN: 9781439815670