On Wed, May 25, 2005 at 01:58:07PM -0300, lucas@presserv.org wrote:
> The records is entire duplicated (with all fields having the same data),
> thinking the "numos" fields as primary key I have executed the query:
>
> # DELETE from lanctos where not oid=(select oid from lanctos as l2 where
> l2.numos=lanctos.numos limit 1);
That's because you don't have an index on the Oid column. You may want
to try using the ctid column instead; it's the physical row position in
the table so it doesn't need to scan the whole table each time.
HTH,
--
Alvaro Herrera (<alvherre[a]surnet.cl>)
"The only difference is that Saddam would kill you on private, where the
Americans will kill you in public" (Mohammad Saleh, 39, a building contractor)