Re: free space map usage

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On Tuesday 14 October 2003 02:16 pm, Tom Lane wrote:
> "Jeremy M. Guthrie" <jeremy(dot)guthrie(at)berbee(dot)com> writes:
> > Is there any way to determine how much of the free space map is currently
> > i= n=20
> > use?(ie. where and what it is tracking?) I vacuum on a regular basis but
> > I= =20
> > never hold in terms of disk space usage.
>
> Not in 7.3 AFAIR. In 7.4 a full-database VACUUM VERBOSE will end with
> the info you want:
>
> regression=# vacuum verbose;
> ... much cruft ...
> INFO: free space map: 11 relations, 144 pages stored; 272 total pages
> needed DETAIL: Allocated FSM size: 1000 relations + 20000 pages = 178 kB
> shared memory. VACUUM
> regression=#
>
> This tells me I'm only using about 1% of the FSM space (272 out of 20000
> page slots).
>
> > I jacked up the free space map=20
> > pages but this doesn't appear to be working.
>
> You know you have to restart the postmaster to make those changes take
> effect, right?
Yup. I still see no effect after restart.

> regards, tom lane

- --
Jeremy M. Guthrie
Systems Engineer
Berbee
5520 Research Park Dr.
Madison, WI 53711
Phone: 608-298-1061

Berbee...Decade 1. 1993-2003
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