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Re: Help with performance problems

From: "Chris Hoover" <revoohc(at)sermonaudio(dot)com>
To: "Ron St-Pierre" <rstpierre(at)syscor(dot)com>
Cc: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Help with performance problems
Date: 2004-04-23 19:27:24
Message-ID: 200404231527.24230.revoohc@sermonaudio.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Friday 23 April 2004 14:57, Ron St-Pierre wrote:
Does this apply to 7.3.4 also?
>  Actually, since he's running 7.4, there's an even better way.  Do a
>  "VACUUM VERBOSE" (full-database vacuum --- doesn't matter whether you
>  ANALYZE or not).  At the end of the very voluminous output, you'll see
>  something like
>
>
>  INFO:  free space map: 240 relations, 490 pages stored; 4080 total pages
> needed DETAIL:  Allocated FSM size: 1000 relations + 20000 pages = 178 kB
> shared memory.
>
>
>  Here, I would need max_fsm_relations = 240 and max_fsm_pages = 4080 to
>  exactly cover the present freespace needs of my system.  I concur with
>  the suggestion to bump that up a good deal, of course, but that gives
>  you a real number to start from.
>
>
>  The DETAIL part of the message shows my current settings (which are the
>  defaults) and what the FSM is costing me in shared memory space.
>
> Good luck
> Ron
>
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings


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