Skip to Main Content
Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

Hints

Hints can be used to direct the Oracle query optimizer to use a specific optimization technique for a query.

Hints are embedded as comments in a SQL query, with the following syntax:

                  sql_action /*+ hint */

or

                  sql_action --+ hint

where sql_action is a SELECT, INSERT, UPDATE, or DELETE statement. The hint can also include a text comment for documentation purposes. Any statement can have multiple hints. If a hint is incorrect or invalid, Oracle ignores the hint without causing an error.

The following sections describe hints in a variety of categories: optimizer mode hints, access path hints, query transformation hints, join hints, parallel execution hints, and miscellaneous hints.

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 Internals

Oracle Internals

Donald K. Burleson
Oracle PL/SQL

Oracle PL/SQL

Lewis Cunningham
Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second Edition

Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second Edition

Rick Greenwald, Robert Stackowiak, Jonathan Stern

Publisher Resources

ISBN: 0596003366Errata Page