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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

Query transformation hints

The following hints direct the optimizer to transform the submitted query:

USE_CONCAT

Forces an OR list to be transformed into a UNION ALL compound query.

NO_EXPAND

Prevents OR expansion for the query. New with Oracle8i.

REWRITE

Forces the use of materialized views. New with Oracle8i.

EXPAND_GSET_TO_UNION

Forces query using grouping sets to be transformed into a UNION ALL compound query. New with Oracle9i.

NOREWRITE

Prevents query rewrite for materialized views. New with Oracle8i.

MERGE( table )

Specifies merging a view with a query. Complex view merging must be enabled for this hint to operate.

NO_MERGE( table )

Disallows complex view merging.

STAR_TRANSFORMATION

Suggests, but does not force, a transformation of the query into a star query.

FACT( table )

Specifies that the table is used as the fact table in a star transformation. New with Oracle9i.

NO_FACT( table )

Specifies that the table should not be used as the fact table in a star transformation. New with Oracle9i.

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Publisher Resources

ISBN: 0596003366Errata Page