Re: Optimizing huge inserts/copy's

Hi,

I knew that if no constarint, it populate very quick, my question is:
when two tables have been
reloaded, then I want to add a foreign key constraint to it, say:
tableA has primary key column (id)
tableB has a column (id) references it, so I say:
ALTER TABLE tableB ADD CONSTRAINT distfk FOREIGN KEY (id) REFERENCES
tableA(id)  ON DELETE CASCADE ;

It just seems takes forever.

Thanks anyway.


Webb Sprague wrote:

> I am experimenting with this too.  If I have any
> indexes at all, the copy's get VERY SLOW as the table
> gets big.  Delete ALL your indexes, do your copy's,
> and then create your indexes again.
>
> Good luck.
> --- Jie Liang <jliang@ipinc.com> wrote:
> > Hi, there,
> >
> > I tried different  ways,  include vaccum table ,
> > ensure index works, it
> > still is as slow as ~100rows per minute.
> >
> >
> > Stephan Szabo wrote:
> >
> > > On Tue, 29 Aug 2000, Jie Liang wrote:
> > >
> > > > Hi, there,
> > > >
> > > > 1. use copy ... from '.....';
> > > > 2. write a PL/pgSQL function and pass multiple
> > records as an array.
> > > >
> > > > However, if your table have a foreign key
> > constraint, it cannot be speed
> > > > up,
> > > >
> > > > I have same question as you, my table invloving
> > 9-13 million rows, I
> > > > don't
> > > > know how can I add a foreign key them also?
> > >
> > > I haven't tried it on really large tables, but
> > does it turn out faster to
> > > use ALTER TABLE ADD CONSTRAINT to add the foreign
> > key constraint after the
> > > data is loaded and the indexes are created?
> >
> > --
> > Jie LIANG
> >
> > Internet Products Inc.
> >
> > 10350 Science Center Drive
> > Suite 100, San Diego, CA 92121
> > Office:(858)320-4873
> >
> > jliang@ipinc.com
> > www.ipinc.com
> >
> >
> >
>
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--
Jie LIANG

Internet Products Inc.

10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873

jliang@ipinc.com
www.ipinc.com