On Mon, Aug 01, 2011 at 04:42:23PM +0200, Willy-Bas Loos wrote:
> Hi,
>
> I'ver been wondering how to set the number of rows that are scanned by
> analyze. (I want to increase it)
> I couln't find it at first but when i read closer i found that is does:
> "The largest statistics target among the columns being analyzed
> determines the number of table rows sampled to prepare the
> statistics."
> (http://www.postgresql.org/docs/8.4/interactive/sql-analyze.html)
>
>
> My question is *HOW* does it "detirmine the number of table rows
> sampled" with the statistics target?
> What is the formula behind it?
>
> I am not familiar enough with the source code to figure that out
> myself. sry about that.
> Would be good to include in the docs if we find out.
>
> Cheers,
>
> WBL
>
Peruse the above reference a bit more carefully. It is actually
explained pretty well.
Regards,
Ken