Oracle | Habilitar deshabilitar constraints

ALTER TABLE esquema1.tabla1 MODIFY CONSTRAINT test_fk_1 DISABLE;
ALTER TABLE esquema2.tabla2 MODIFY CONSTRAINT test_fk_2 ENABLE;

ó tambien.....

ALTER TABLE esquema1.tabla1 DISABLE CONSTRAINT test_fk_1;
ALTER TABLE esquema2.tabla2 ENABLE CONSTRAINT test_fk_2;