Re: number of relations reported by vacuumdb -av

[Martin Gainty <mgainty@xxxxxxxxxxx>]

Good Morning Irene

could you verify the requirement to set
max_fsm_pages (integer) to 16 times new value of 'max_fsm_relations'

Thanks!
Martin Gainty
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> Date: Sat, 18 Apr 2009 03:23:49 -0700
> From: ibarg@xxxxxxxx
> To: pgsql-general@xxxxxxxxxxxxxx
> Subject: Re: number of relations reported by vacuumdb -av
>
> never mind....I found the answer in the archives.postgresql.org. The
> answer is 'yes' I use the sum of relations from all of the databases. So
> I have reset 'max_fsm_relations' from 1000 to 2000.
>
> Irene Barg wrote:
> > Hi,
> >
> > I have a PostgreSQL installation with 8 databases (counting postgres,
> > template0, and template1). I run 'vacuumdb -z' daily on 3 of the largest
> > user databases. The vacuumdb logs show the 'max_fsm_pages' need to be
> > increased with almost each vacuum. So I did a 'vacuumdb -av' on all the
> > db's:
> >> INFO: free space map contains 81016 pages in 100 relations
> >> DETAIL: A total of 80000 page slots are in use (including overhead).
> >> 187792 page slots are required to track all free space.
> >> Current limits are: 80000 page slots, 1000 relations, using 534 KB.
> >> NOTICE: number of page slots needed (187792) exceeds max_fsm_pages
> >> (80000)
> >> HINT: Consider increasing the configuration parameter "max_fsm_pages"
> >> to a value over 187792.
> >> VACUUM
> >
> > I have a couple questions.
> >
> > 1) I can increase 'max_fsm_pages' from 80K to 200K, but why does it keep
> > growing?
> >
> > The main database sees on average 2500-5000 rows inserted per day, and
> > deletes are relatively small (although I don't have stats on deletes).
> >
> > 2) How is '100 relations' getting calculated?
> >
> > If I connect to each one of my 8 db's and do:
> >
> > select count(*) from pg_class;
> >
> > The total number of relations is 1725. So shouldn't I increase
> > 'max_fsm_relations' from 1000 to 1725?
> >
> > Thank you in advance.
> >
> > -- irene
> > ---------------------------------------------------------------------
> > Irene Barg Email: ibarg@xxxxxxxx
> > NOAO/AURA Inc. http://www.noao.edu/noao/staff/ibarg
> > 950 N. Cherry Ave. Voice: 520-318-8273
> > Tucson, AZ 85726 USA FAX: 520-318-8360
> > ---------------------------------------------------------------------
> >
>
> --
> ---------------------------------------------------------------------
> Irene Barg Email: ibarg@xxxxxxxx
> NOAO/AURA Inc. http://www.noao.edu/noao/staff/ibarg
> 950 N. Cherry Ave. Voice: 520-318-8273
> Tucson, AZ 85726 USA FAX: 520-318-8360
> ---------------------------------------------------------------------
>
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