Refrential integrity between 2 oracle DB

Question

I have to create a foreign key constraint with the table in diffrent oracle DB.
I tried creating a synonym through DBlink but mentioning that synonym as the refrence throws error:
ORA-02444: Cannot resolve referenced object in referential constraints.
The same thing works if refrenced tables reside in different schema on the same DB instead of different DB server.
Can anyone help me out with the probable solution of achieving refrential integrity between tables across two diffrent DB.

Answer 1

Thanx a lot to point out me , here i would like to make some coments point out me if i am worng.
I have read the Kamal's comments "trigger cannot see
unsaved changes",Its the same with constraint but
deadlock occurs while with trigger dead lock will not
occur.
We have to be cautious against employing this design as APC said.I agree with APC comments regarding
performance, any network problems can cause your
application to slow down as well break down.
What i suggested to OP create two trigger one at yours master site to prevent child deletion and another one at child site to check parent existence.
As Anwar suggested a replica of master site at child site and then implement the FK at child site ,as well for preventing deletion vice versa agreed.
Apart from designing i have also confronted the same scenario which lead me
some complexity but compell to implement trigger (though at certain level it takes
extra attention).
So the only hope to redisgn but is there any alternate as opposed to redisgn???
Khurram