* Dave Edmondson <david@jlc.net> [010219 14:40]:
> > > yes. I ran VACUUM ANALYZE after creating the indicies. (Actually, I VACUUM
> > > the database twice a day.) The data table literally has 145972 rows, and
> > > 145971 will match conf_id 4...
> >
> > Hm. In that case the seqscan on data looks pretty reasonable ... not
> > sure if you can improve on this much, except by restructuring the tables.
> > How many rows does the query actually produce, anyway? It might be that
> > most of the time is going into sorting and delivering the result rows.
>
> All I'm really trying to get is the latest row with a conf_id of 4... I'm
> not sure if there's an easier way to do this, but it seems a bit ridiculous
> to read in almost 146000 rows to return 1. :(
is there a timestamp or date/time tuple in the row? If so, index
THAT.
LER
>
> --
> David Edmondson <david@jlc.net>
> GMU/FA d-(--) s+: a18>? C++++$ UB++++$ P+>+++++ L- E--- W++ N- o K-> w-- O?
> M-(--) V? PS+ PE+ Y? PGP t 5 X R+ tv-->! b DI+++ D+ G(--) e>* h!>+ r++ y+>++
> ICQ: 79043921 AIM: AbsintheXL #music,#hellven on irc.esper.net
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749