Re: tuning our database by increasing shared buffer

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Hello Again

Here is the end output from a vacuum verbose on one of the databases. What exactly am I looking for. If I am reading the correctly then I am ok with the current settings.

INFO:  free space map contains 2667 pages in 22 relations
DETAIL:  A total of 3008 page slots are in use (including overhead).
3008 page slots are required to track all free space.
Current limits are:  153600 page slots, 1000 relations, using 965 kB.

John Allgood
Senior Systems Administrator
Turbo, division of OHL
2251 Jesse Jewell Pky. NE
Gainesville, GA 30507
tel: (678) 989-3051  fax: (770) 531-7878

jallgood@xxxxxxx
www.ohl.com


-----Original Message-----
From: Glyn Astill [mailto:glynastill@xxxxxxxxxxx] 
Sent: Wednesday, June 24, 2009 9:46 AM
To: Barbara Stephenson; Tom Lane; Allgood, John
Cc: pgsql-admin@xxxxxxxxxxxxxx
Subject: Re:  tuning our database by increasing shared buffer


Run a vacuum verbose and look at the output at the end.

Word is that as of 8.4 these parameters will autotune themselvs.

--- On Wed, 24/6/09, Allgood, John <jallgood@xxxxxxx> wrote:

> From: Allgood, John <jallgood@xxxxxxx>
> Subject: Re:  tuning our database by increasing shared buffer
> To: "Barbara Stephenson" <barbara@xxxxxxxxxxxxx>, "Tom Lane" <tgl@xxxxxxxxxxxxx>
> Cc: pgsql-admin@xxxxxxxxxxxxxx
> Date: Wednesday, 24 June, 2009, 2:34 PM
> 
> 
> 
>  
>  
> 
> 
> 
> 
> 
> 
>  
> 
> 
> 
> Hello All 
> 
>    
> 
> I am working with  Barbara
> on this project and I am curios about
> what would be a good starting place for setting the
> max_fsm_relations and
> max_fsm_pages. Here are the current values max_fsm_pages =
> 153600 and the
> max_fsm_relations is set to the default of 1000. I have
> have read that the
> output from vacuum can help determine the values. We are
> using the autovacuum
> daemon. Is there some logging from that process that could
> help. 
> 
>    
> 
> Thanks  
> 
>    
> 
>    
> 
> 
> 
> John
> Allgood 
> 
> Senior
> Systems Administrator 
> 
> Turbo,
> division of OHL 
> 
> 2251
> Jesse Jewell Pky. NE 
> 
> Gainesville,
> GA 30507 
> 
> tel:
> (678) 989-3051  fax: (770) 531-7878 
> 
> 
>   
> 
> jallgood@xxxxxxx
> 
> 
> www.ohl.com
> 
> 
> 
> 
>    
> 
> 
> 
> 
> 
> From:
> pgsql-admin-owner@xxxxxxxxxxxxxx
> [mailto:pgsql-admin-owner@xxxxxxxxxxxxxx] On Behalf Of
> Barbara
> Stephenson
> 
> Sent: Tuesday, June 23, 2009 3:43 PM
> 
> To: Tom Lane
> 
> Cc: pgsql-admin@xxxxxxxxxxxxxx
> 
> Subject: Re:  tuning our database by
> increasing shared buffer 
> 
> 
> 
> 
> 
>    
> 
> Thank ypu!
> 
> 
> 
> 
> 
> Tom Lane wrote:  
> 
> Barbara Stephenson <barbara@xxxxxxxxxxxxx>
> writes:   
> 
> We will
> be consolidating from 4 databases to 2 and want to make sure
> that  these parameters are the only ones
> that need changing.   Please
> advise.     
> 
>      
> 
> Current                                                       
> Future=====                                                         
> =====Max_connection =
> 50                                   
> 125Shared_buffers =
> 16MB                                 
> 48MB     
> 
>   You will need to make sure that the
> FSM size parameters are correct forthe combined
> databases, too.     
> 
> Shouldn't
> we increase the max_locks_per_transaction from 64 to 100 or
> 128 since we have more than doubled the # of
> connections?   
>  
> 
>   No, because the lock table size
> automatically scales withmax_connections. 
> (Probably max_locks_per_transaction should have
> beencalled max_locks_per_connection
> ...)     
> 
> max_prepared_transaction
> is set at default of 5 which is says if we use it
> toset it to
> max_connection.   
>  
> 
>   Are you using prepared transactions
> at all?  If not, I'd actuallyrecommend
> setting that to zero to make sure nobody creates a
> preparedtransaction accidentally.  You do
> *not* want anyone doing PREPARETRANSACTION unless
> there's an XA manager or something in place to
> makesure the prepared xact gets committed or
> rolled back reasonably soon.
>                        
> regards, tom lane     
> 
>    
> 
> 
> 
> -- 
> 
> 
> 
>  
> 
> Regards,
>  Barbara
> StephensonEDI
> Specialist/ProgrammerTurbo, division of
> OHL2251 Jesse Jewell
> PkwyGainesville, GA 
> 30507tel: (678)989-3020 fax:
> (404)935-6171barbara@xxxxxxxxxxxxxxxxxxxxxxxx
> 
> 
> 
> 
> 
> 
> 
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