disabling foreign keys

I want to write a script that disables all foreign keys at once. I have tried the following

update

    user_constraints
set

    status = 'DISABLED'
where

    constraint_name like 'ITX%FK_' ;

(all foreign key names follow a regular pattern) This produces an error message : insufficient privileges.

I think the problem is that I have insufficient priveliges set to do this. Our sysadmin says that it can't be done at all. Is he right? If so, is there any other way of doing it?

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