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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
204 Automated Physical Database Design and Tuning
The following constraint enforces that no SELECT query degrades by more
than 10% compared with the currently deployed configuration:
FORQinW
WHERE type(Q) = SELECT
ASSERT cost(Q, C) 1.1 * cost(Q, COrig)
The last constraint enforces that no index can be replaced by the corre-
sponding narrow alternative without at least doubling the cost of some query:
FORIinC
FORQinW
ASSERT cost(Q, C-I+narrow(I))/cost(Q, C) 2
where narrow(I) results in a single-column index with I’s leading column.
For instance, we have that narrow(R(a, b, c))=R(a).
11.1.3 Language Semantics
Constrained physical design is a multiconstraint, ...
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Publisher Resources

ISBN: 9781439815670