Re: Doubt w.r.t vacuum

"Shridhar Daithankar" <shridhar_daithankar@persistent.co.in> writes:

> Hi,
> 
> I was just wondering over it. This is for difference between vacuum full and 
> vacuum analyze. Can somebody enlighten,
> 
> 1. IIRC vacuum recovers/reuses dead tuples generated from update but can not do 
> so for delete? Why?

YDNRC.

> 2. Vacuum full locks entire table, is it possible that it locks a
> page at a time and deal with it. It will make vacuum full
> non-blocking at the cost of letting it run for a longer time. Or is
> it that the defragmentation algorithm needs more than a page?

This I don't know, but I imagine that if what you suggest was easy to
do it would have been done, and there would have been no need for two
different kinds of VACUUM.

-DOUG