Oracle® Database Reference 11g Release 2 (11.2) Part Number E25513-03 |
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Property | Description |
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Parameter type | String |
Syntax | STAR_TRANSFORMATION_ENABLED = { FALSE | TRUE | TEMP_DISABLE } |
Default value | FALSE |
Modifiable | ALTER SESSION , ALTER SYSTEM |
Basic | Yes |
STAR_TRANSFORMATION_ENABLED
determines whether a cost-based query transformation will be applied to star queries.
Values:
FALSE
The transformation will not be applied.
TRUE
The optimizer will consider performing a cost-based query transformation on the star query.
TEMP_DISABLE
The optimizer will consider performing a cost-based query transformation on the star query but will not use temporary tables in the star transformation.
See Also:
Oracle Database Concepts for information on star queries
Oracle Database Performance Tuning Guide for information on enabling star query