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Re: Index Only Scan vs Cache - Mailing list pgsql-general

From	Shujie Shang
Subject	Re: Index Only Scan vs Cache
Date	July 14, 2015 12:59:46
Msg-id	CAJrojKWfObgg515XsgstAjrjSz4HoxTLQyqcKJ-EWFNz1Y0Kbg@mail.gmail.com Whole thread Raw
In response to	Re: Index Only Scan vs Cache (Andy Colson <andy@squeakycode.net>)
Responses	Re: Index Only Scan vs Cache (Pavel Stehule <pavel.stehule@gmail.com>)
List	pgsql-general

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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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From: Igor Stassiy
Date: 14 July 2015, 12:12:38
Subject: Creating table with data from a join

From: Pavel Stehule
Date: 14 July 2015, 13:04:22
Subject: Re: Index Only Scan vs Cache

Re: Index Only Scan vs Cache - Mailing list pgsql-general

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