Re: strange 'vacuum verbose analyze' behaviour

On Thu, 27 Jan 2005, Tom Lane wrote:

> Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> writes:
>> Day ago we run 'vacuum verbose analyze;' and now we're observing
>> strange output (see below). We see many repeated passes through the
>> table 'usno' and all indices (2).
>
> Nothing strange about it: that's how vacuum deals with large tables.
> You can reduce the number of passes over the indexes by increasing
> maintenance_work_mem (aka vacuum_mem). It looks like you have that
> set to 16MB, which is enough to hold about 2.79M 6-byte CTIDs. When
> that fills up, we have to go and clean out the corresponding index
> entries before we resume scanning the heap.
>

thanks for info, just increased maintenance_work_mem and will see

> It is a bit odd that nothing is getting deleted from "ipix_ind" ...
> is that a partial index?

no.

wsdb=# \d ipix_ind
Index "public.ipix_ind"
Column | Type
--------+--------
ipix | bigint
btree, for table "public.usno"

>
> regards, tom lane
>

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83