Re: Anything to be gained from a 'Postgres Filesystem'?

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От Tom Lane
Тема Re: Anything to be gained from a 'Postgres Filesystem'?
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Msg-id 28208.1099596848@sss.pgh.pa.us
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Ответ на Re: Anything to be gained from a 'Postgres Filesystem'?  (Simon Riggs <simon@2ndquadrant.com>)
Ответы Re: Anything to be gained from a 'Postgres Filesystem'?  (Simon Riggs <simon@2ndquadrant.com>)
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Simon Riggs <simon@2ndquadrant.com> writes:
> On Thu, 2004-11-04 at 15:47, Chris Browne wrote:
>> Something like a "read_uncached()" call...
>>
>> That would mean that a seq scan or a vacuum wouldn't force useful data
>> out of cache.

> ARC does almost exactly those two things in 8.0.

But only for Postgres' own shared buffers.  The kernel cache still gets
trashed, because we have no way to suggest to the kernel that it not
hang onto the data read in.

            regards, tom lane

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