Horton

Re: pg_autovacuum is nice ... but ...

Marc Fournier <scrappy@postgresql.org>

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From: "Marc G. Fournier" <scrappy@postgresql.org>
To: Justin Clift <justin@postgresql.org>
Cc: pgsql-www@postgresql.org
Date: 2004-11-04T00:20:47Z
Lists: pgsql-hackers 
On Thu, 4 Nov 2004, Justin Clift wrote:

> Marc G. Fournier wrote:
> <snip>
>> Do a vacuum full analyze on the two databases being called, and load time 
>> went from 2.4sec to .46sec:
>
> Hmmmm, is there any chance your Free Space Map settings aren't high enough?

I posted once asking about that, but got no responses :)

Here is a vacuum verbose on gborg's database:

INFO:  free space map: 1000 relations, 7454 pages stored; 23072 total pages needed
DETAIL:  Allocated FSM size: 1000 relations + 20000 pages = 178 kB shared memory.
and this is portal:

INFO:  free space map: 1000 relations, 7425 pages stored; 23024 total pages needed
DETAIL:  Allocated FSM size: 1000 relations + 20000 pages = 178 kB shared memory.

so, you tell me ... should I increase them?  I haven't been able to find 
any docs that talk about this :(

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org           Yahoo!: yscrappy              ICQ: 7615664