> -----Original Message-----
> From: pgsql-hackers-owner(at)hub(dot)org [mailto:pgsql-hackers-owner(at)hub(dot)org]On
> Behalf Of Jeff Hoffmann
>
[snip]
>
> pages_fetched = ceil(baserel->pages * log(tuples_fetched /
> baserel->pages + 1.0));
>
Unfortunately I didn't understand this well either.
pages_fetched seems to be able to be greater than
baserel->pages. But if there's sufficiently large buffer
space pages_fetched would be <= baserel->pages.
Are there any assupmtions about buffer space ?
Regards.
Hiroshi Inoue
Inoue(at)tpf(dot)co(dot)jp