Re: Index Only Scan vs Cache

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От Shujie Shang
Тема Re: Index Only Scan vs Cache
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Msg-id CAJrojKWfObgg515XsgstAjrjSz4HoxTLQyqcKJ-EWFNz1Y0Kbg@mail.gmail.com
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Ответ на Re: Index Only Scan vs Cache  (Andy Colson <andy@squeakycode.net>)
Ответы Re: Index Only Scan vs Cache
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Does PG has its own data cache? I don't think so.
I think PG just using the filesystem cache.

On Fri, Jul 10, 2015 at 2:06 AM, Andy Colson <andy@squeakycode.net> wrote:
On 7/9/2015 12:41 PM, Tom Lane wrote:
Andy Colson <andy@squeakycode.net> writes:
My question is:  Will PG cache only the index (assuming it can always do
an Index Only Scan), or will it cache the table as well?

The table blocks would fall out of cache if they're never touched.

                        regards, tom lane



 Sweet!  Thanks Tom.



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