How to change all fk constraints in schema to refer to different schema

Question

Hi,
We wish to change all the fk constraints which point to tables on one schema to same table names but owned by a different schema.
Is this possible?
Thinking of query user_constraints
select *
from user_constraints r
where r.constraint_type = 'R'
and r.r_owner = 'REF'
can put this inside loop but can you modify fk constriant to refer to table owned by different schema
11.2.0.3
Don't really want to need to drop and recreate.
Thanks
Edited by: user5716448 on 06-Apr-2012 04:26

Answer 1

Yes. You need to drop the constraint and recreate it using the clause 'new_schema.objct_name' in the constraint creation statement.
For example, if you want to change the constraint cons_1 to point to some column col_1 in schema sch_2 then the sequence of statements will be like,
ALTER TABLE TAB_1 DROP CONSTRAINT CONS_1;
ALTER TABLE TAB_1 ADD CONSTRAINT CONS_1 FOREIGN KEY COL_1 REFERENCES SCH_2.TAB_1(COL_1);
Remember, you have to have all the privileges required to use/reference the table in schema_2.