Re: Importing Large Amounts of Data - Mailing list pgsql-hackers

On Monday 15 April 2002 05:15, Christopher Kings-Lynne wrote:
> > On Monday 15 April 2002 03:53, Christopher Kings-Lynne wrote:
> > > BTW, instead of:
> > >
> > > CREATE UNIQUE INDEX bigone_pkey ON bigone (rec_no);
> > >
> > > do:
> > >
> > > ALTER TABLE bigone ADD PRIMARY KEY(rec_no);
> >
> > I am sorry, could you please elaborate more on the difference?
>
> They have the same _effect_, it's just that the first sytnax does not mark
> the index as the _primary_ index on the relation.

Yes, I know. I mean how does this affect performance? How this can change
planner decision? Does it have any effect except cosmetical one?

--
Denis