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thanks January 11, 2003 - am UTC it is true that if you set the constraint to initially deferred -- that as the name implies -- it will be deferred initially and you need not set all constraints or that constraint to deferred. Specify ONLY syntax if the view in the UPDATE clause is a view that belongs to a hierarchy and you do not want to update rows from any of its subviews." I don't quite understand this. A: I recommend you understand the implications (almost none on a fkey, totally different type of index with a pkey) and use your judgement) When you said 'almost none on a fkey', can you clarify your choice of the word 'almost'? Reading all this I came up to conclusion: "by default you should make all primary key/foreign key constraints deferrable initially immediate". This can and will affect query plans and might not be what you wanted.Most of the time, most all of the time, almost all of the time - you want non-deferrable constraints.INITIALLY IMMEDIATE Specify INITIALLY IMMEDIATE to indicate that at the start of every transaction, the default is to check this constraint at the end of every DML statement.If you do not specify INITIALLY, INITIALLY IMMEDIATE is the default.It says: Specify NOT DEFERRABLE to indicate that this constraint is checked at the end of each DML statement.If you do not specify either word, then NOT DEFERRABLE is the default.

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materialized views are the exception, an updatable materialized view should use deferrable constraints - as per documentation.

Restrictions: You cannot defer a NOT DEFERRABLE constraint with the SET CONSTRAINT(S) statement. Hi Tom, If we create constraints on EMP and DEPT (Both INITIALLY DEFERRED) or If we create RI constraint on EMP (INITIALLY DEFERRED) then directly we can update the master (DEPT) and child (EMP). do you recommend to make all primary key/foreign key constraints deferred when I create them? If I did not do that, and decided to defer it after creation can I do something like "Alter table emp set constraint xxx deferred".

So when do we use the SET CONSTRAINTS [ October 24, 2002 - pm UTC umm, when the constraints are deferrable initially immediate would be a case. When I try to compile the following stored function: ------------------------------------------------------- CREATE OR REPLACE FUNCTION ttt return number IS BEGIN SET CONSTRAINTS DEFERRED; return 0; END ttt; ------------------------------------------------------- I get: PLS-00103: Encountered the symbol "CONSTRAINTS" when expecting one of the following: transaction What's wrong? Thank you, November 14, 2002 - pm UTC 1) i recommend you understand the implications (almost none on a fkey, totally different type of index with a pkey) and use your judgement 2) no, you need to recreate the constraint.

INITIALLY DEFERRED Specify INITIALLY DEFERRED to indicate that this constraint is DEFERRABLE and that, by default, the constraint is checked only at the end of each transaction.

Restrictions: You cannot defer a NOT DEFERRABLE constraint with the SET CONSTRAINT(S) statement.

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