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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
114 Automated Physical Database Design and Tuning
B storage, we simply use T
tr
as the penalty associated with each
transformation tr.
6.2.3 Variations and Optimizations
We next briefly describe some minor optimizations and variations to the top-
down approach introduced in this section.
Shortcut evaluation: When evaluating the cost of a configuration C,we
might reach a point in which the SELECT cost of a subset of queries in
C is larger than the total cost of the current best configuration C
best
.In
this case, we know that neither C nor any configuration that is further
relaxed from C would be more efficient than C
best
. Therefore, we can stop
evaluating C (thus ...
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Publisher Resources

ISBN: 9781439815670