Re: ADD FOREIGN KEY (was Re: [GENERAL] 7.4Beta)

Andreas Pflug kirjutas E, 29.09.2003 kell 12:04:
> Christopher Kings-Lynne wrote:
>
> > You could just as easily argue that the lack of integrity testing at
> > data load time was equally a bug.
> >
> > I think we need someway of telling postgres to suppress a foreign key
> > check.
> >
> > The main problem is that the foreign key column is often not indexed.
>
> So a db designer made a bloody mistake.
> The problem is there's no easy way to find out what's missing.
> I'd really like EXPLAIN to display all subsequent triggered queries
> also, to see the full scans caused by missing indexes.

It could probably be doable for EXPLAIN ANALYZE (by actually tracing
execution), but then you will see really _all_ queries, i.e. for a 1000
row update you would see 1 UPDATE query and 1000 fk checks ...

OTOH, you probably can get that already from logs with right logging
parameters.

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Hannu