2008/9/12 Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
> On Fri, Sep 12, 2008 at 12:14 PM, Rafael Domiciano
> <rafael(dot)domiciano(at)gmail(dot)com> wrote:
> > Hi there,
> > In my DB I have a couple of FK, so the change of referenced columns is a
> > quite complicated.
> > Today, I DISABLE TRIGGER ALL on the tables envolved and then ENABLE
> > ALL to back them.
> > Is there a better way to do that?
> Depends. Are other people connected to the server when you do it?
> disable trigger disables the triggers for everybody, not just you if I
> remember correctly. If other folks are using the db, then they can
> insert bad data during that period.
I do it in a transaction, so there's no problem about the other folks...!
> > I read something about SET CONSTRAINTS ALL DEFFERED, but I don't know how
> > use it.
> the constraints have to created as deferrable to do that. then, in a
> transaction, you can do something like:
Can I turn my FK into deferrable FK only in that transaction?
> update in a way that would normally violate an FK
> insert in a way that fixes the previous statement's FK relationship
> and it will work as long as the constraints all make sense by the time
> you get to commit.
That's what I wanna to do!
> Note that unique constraints are not deferrable in pgsql.
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