Re: GUC variable for setting number of local buffers

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От Bruce Momjian
Тема Re: GUC variable for setting number of local buffers
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Msg-id 200503201348.j2KDmbh28307@candle.pha.pa.us
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Ответ на Re: GUC variable for setting number of local buffers  (Markus Bertheau <twanger@bluetwanger.de>)
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Markus Bertheau wrote:
-- Start of PGP signed section.
> ? ???, 19/03/2005 ? 12:57 -0500, Tom Lane ?????:
> 
> > It's already true that the individual buffers, as opposed to the buffer
> > descriptors, are allocated only as needed; which makes the overhead
> > of a large local_buffers setting pretty small if you don't actually do
> > much with temp tables in a given session.  So I was thinking about
> > making the default value fairly robust, maybe 1000 (as compared to
> > the historical value of 64...).
> 
> Why does the dba need to set that variable at all then?

It is like sort_mem that is local memory but is limited so a single
backend does not exhaust all the RAM on the machine.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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