QUERY_REWRITE_INTEGRITY

Property Description
Parameter type String
Syntax QUERY_REWRITE_INTEGRITY = { enforced | trusted | stale_tolerated }
Default value enforced
Modifiable ALTER SESSION, ALTER SYSTEM
Oracle RAC Multiple instances can have different values.

QUERY_REWRITE_INTEGRITY determines the degree to which Oracle must enforce query rewriting. At the safest level, Oracle does not use query rewrite transformations that rely on unenforced relationships.

Values:

  • enforced

    Oracle enforces and guarantees consistency and integrity.

  • trusted

    Oracle allows rewrites using relationships that have been declared, but that are not enforced by Oracle.

  • stale_tolerated

    Oracle allows rewrites using unenforced relationships. Materialized views are eligible for rewrite even if they are known to be inconsistent with the underlying detail data.

See Also: