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Oracle Data Warehouse Tuning for 10g
book

Oracle Data Warehouse Tuning for 10g

by Gavin JT Powell
April 2011
Intermediate to advanced content levelIntermediate to advanced
504 pages
16h 49m
English
Digital Press
Content preview from Oracle Data Warehouse Tuning for 10g
7.1
Basic Query Tuning 173
Chapter 7
ments. Let’s examine each in turn with various options and recommenda-
tions for potential improvement.
Equi, Anti, and Range
The syntax of equi, anti, and range comparison conditions is as follows:
<expression> { [!]= | > | < | <= | >= } <expression>
<expression> [ NOT ] BETWEEN <expression> AND <expression>
Using an equals sign (equi) is the fastest comparison condition if a
unique index exists, potentially finding a single row as an exact row hit. Any
type of anti comparison, such as != or NOT, is looking for what is not in a
table and thus must read the entire table regardless; sometimes full index
scans can ...
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Publisher Resources

ISBN: 9781555583354