Re: limiting hint bit I/O

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От Robert Haas
Тема Re: limiting hint bit I/O
Дата
Msg-id AANLkTi=Ex3XKryfSD1Yqc3NYpHvmd_9+euhQ4e2=pZL1@mail.gmail.com
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Ответ на Re: limiting hint bit I/O  (Cédric Villemain <cedric.villemain.debian@gmail.com>)
Список pgsql-hackers
On Sat, Feb 5, 2011 at 5:04 PM, Cédric Villemain
<cedric.villemain.debian@gmail.com> wrote:
> Robert, I am unsure with the hint_bit_write_allowance counter. It
> looks a bit fragile because
> nothing prevent  hint_bit_write_allowance counter to increase a lot,
> so that is not 100 but X*100 next hint bit will be written. Isn't it ?

hint_bit_write_allowance can never be more than 100.  The only things
we ever do are set it to exactly 100, and decrease it by 1 if it's
positive.

> Also, won't buffer_allocation_count hit INT limit ?

Sure, if the backend sticks around long enough, but it's no big deal
if it overflows.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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