Oracle in a Nutshell

Name

Constraint_State_Clause

Synopsis

{DEFERRABLE [INITIALLY {IMMEDIATE | DEFERRED}
| NOT DEFERRABLE [INITIALLY IMMEDIATE ] 
}
{ INITIALLY IMMEDIATE  [[NOT] DEFERRABLE] 
| INITIALLY  DEFERRED
}
[RELY | NORELY] 
[USING INDEX
  [INITRANS integer]
  [MAXTRANS integer]
  [PCTFREE  integer]
  [TABLESPACE tablespace_name]
  [NOSORT]
  [LOGGING | NOLOGGING]
  [Storage_Clause]
  [ENABLE | DISABLE]
  [VALIDATE | NOVALIDATE]
  [EXCEPTIONS INTO [schema.]table_name]
]

Allows a constraint to be selectively enabled or disabled.

Keywords

DEFERRABLE

Specifies that the constraint may be deferred. A deferred constraint will not be checked until the transaction is committed.

INITIALLY IMMEDIATE

Specifies that the constraint should initially be evaluated immediately after the execution of each DML statement. The SET CONSTRAINTS statement may be used within a transaction to alter this behavior.

INITIALLY DEFERRED

Specifies that the constraint should initially be checked only when a transaction is committed. The SET CONSTRAINTS statement may be used within a transaction to alter this behavior.

NOT DEFERRABLE

Specifies that constraint checking may not be deferred for this constraint.

RELY

Specifies that a materialized view (or snapshot) will be eligible for query rewrite even if an associated constraint is not validated. This keyword is valid only for materialized views.

NORELY

Specifies that a materialized view (or snapshot) will be not be eligible for query rewrite if an associated constraint is not validated. This keyword is valid only ...