On Sun, Jan 23, 2005 at 03:19:10PM -0600, Jim C. Nasby wrote:
> > People have this weird notion that an index-based plan is always faster
> > than anything else. If you like you can try the operation with "set
> > enable_seqscan = off", but I bet it will take longer.
>
> Well, every other database I've used can do index covering, which means
> index scans *are* faster.
... on those database systems. Indexes are different in Postgres in
general: they don't have visibility info (other systems don't need it,
tuples are always visible), and in some databases you have clustered
indexes, where the index is also the heap.
--
Alvaro Herrera (<alvherre[@]dcc.uchile.cl>)
"We are who we choose to be", sang the goldfinch
when the sun is high (Sandman)
