Skip to Main Content
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
7.3 Tools for Tuning Queries 191
Chapter 7
ORDERED_PREDICATES. Preserves SQL statement precedence
of evaluation, such as the sequence of comparisons in a WHERE
clause.
[NO_]UNNEST. Undoes subquery layers by allowing the optimizer
to attempt to merge subqueries into a calling query. This is probably
contrary to performance tuning of multiple layered SQL statements.
[NO_]PUSH_SUBQ. Resolves subqueries first or last (NO_).
Note: The most important thing to remember about using hints is that a
hint is only a suggestion to the optimizer, not an instruction. In other words,
the optimizer will ignore the hint if it thinks the hint is inappropriate.
7.3
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Oracle 10g Data Warehousing

Oracle 10g Data Warehousing

Lilian Hobbs, Susan Hillson, Shilpa Lawande, Pete Smith
Expert Oracle Enterprise Manager 12c

Expert Oracle Enterprise Manager 12c

Kellyn Pot'vin, Anand Akela, Gokhan Atil, Bobby Curtis, Alex Gorbachev, Niall Litchfield, Leighton Nelson, Pete Sharman

Publisher Resources

ISBN: 9781555583354