OPTIMIZER_SECURE_VIEW_MERGING

Property	Description
Parameter type	Boolean
Default value	`true`
Modifiable	`ALTER SYSTEM`
Range of values	`true \| false`
Basic	No
Oracle RAC	Multiple instances can have different values

OPTIMIZER_SECURE_VIEW_MERGING enables the optimizer to use view merging to improve query performance without performing the checks that would otherwise be performed to ensure that view merging does not violate any security intentions of the view creator.

Values:

false

Oracle does not perform security checks that may prevent view merging and predicate move-around.
true

Oracle performs checks to ensure that view merging and predicate move-around do not violate any security intentions of the view creator.

To take advantage of query rewrite for a particular query, you must disable the OPTIMIZER_SECURE_VIEW_MERGING parameter.