"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