> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Sorry to be getting in here late. Have you tried CLUSTER?
>
> Prolly won't help much. I think what he's getting burnt by
> is that the planner thinks that an indexscan based on the
> LIKE 'http://www.postgresql.org/%' condition will be extremely
> selective --- it has no idea that most of the URLs in his table
> will match that prefix. It's ye same olde nonuniform-distribution
> problem; until we have better statistics, there's not much hope
> for a non-kluge solution.
But I think it will help. There will be lots of index lookups, but they
will be sequential in the heap, not random over the heap.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
Pennsylvania19026
