Comunidad de Programadores
PostgreSQL - Desactivar contrains
Publicado por outrera
(1 intervención) el 24/04/2014 18:01:43
--Per previous comments, it should be a problem. That said, there is a command that may be what you're looking to - it'll set the constraints to deferred so they're checked on COMMIT, not on every delete. If you're doing just one big DELETE of all the rows, it won't make a difference, but if you're doing it in pieces, it will.
SET CONSTRAINTS ALL DEFERRED
--is what you are looking for in that case. Note that constraints must be marked as DEFERRABLE before they can be deferred. For example:
ALTER TABLE table_name
ADD CONSTRAINT constraint_uk UNIQUE(column_1, column_2)
DEFERRABLE INITIALLY IMMEDIATE;
--The constraint can then be deferred in a transaction or function as follows:
CREATE OR REPLACE FUNCTION f() RETURNS void AS
SET CONSTRAINTS ALL DEFERRED;
-- Code that temporarily violates the constraint...
-- UPDATE table_name ...
LANGUAGE plpgsql VOLATILE
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