Alvaro Herrera wrote:
> Tom Lane escribi?:
>
> > If you want ANALYZE to be cheap then you simply don't get to have a
> > trustworthy value of ndistinct.
>
> But then, maybe it's not all that critical that ANALYZE is cheap. For
> example, if we were to rework VACUUM ANALYZE so that on the same pass
> that VACUUM cleans each heap page, a callback is called on the page to
> grab the needed stats.
>
> Partial vacuum is a roadblock for this though :-(
Perhaps it isn't because partial vacuum is going to highlight the
_changed_ blocks, which fits into your idea of merging stats, somehow. ;-)
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
