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Re: Updated FSM display for VACUUM VERBOSE

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: Updated FSM display for VACUUM VERBOSE
Date: 2005-04-23 04:42:29
Message-ID: 200504230442.j3N4gTh20918@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
pgman wrote:
> 	INFO:  free space map: 49 relations with free space, maximum of 1000 relations trackable
> 	INFO:  17266 pages stored, 18000 pages used (with overhead)
> 	INFO:  18768 pages required to store all freespace, maximum of 18000 pages allocatable (171 kB)
> 	NOTICE:  the number of page slots needed (18768) exceeds max_fsm_pages (18000)
> 	HINT:  Consider increasing the configuration parameter "max_fsm_relations"
> 	to a value over 18768.
> 
> I find this output cleaner and easier to understand.  The "pages used"
> value will match either the "required" or "maximum" value on the line
> below.

The "pages used" sentence above is wrong, and it seems the computation
is wrong too.  I just connected to another database, created, inserted,
and deleted rows from a table and see:

	INFO:  free space map: 50 relations with free space, maximum of 1000 
	relations trackable
	INFO:  17266 pages stored, 18016 pages used (with overhead)
	INFO:  18784 pages required to store all freespace, maximum of 18000
	pages allocatable (171 kB)
	NOTICE:  the number of page slots needed (18784) exceeds max_fsm_pages
	(18000)
	HINT:  Consider increasing the configuration parameter "max_fsm_relations"
	to a value over 18784.

The 'pages used' is greater than 18000, which isn't possible.  Seems I
have more work to do.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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Subject: Re: Updated FSM display for VACUUM VERBOSE
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