Re: How to know detailed information about HOT(Heap-Only Tuples)?

From: Adrian Klaver <adrian(dot)klaver(at)gmail(dot)com>
To: 高健 <luckyjackgao(at)gmail(dot)com>
Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: How to know detailed information about HOT(Heap-Only Tuples)?
Date: 2013-08-22 13:34:59
Message-ID: 52161383.10301@gmail.com
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On 08/21/2013 07:20 PM, 高健 wrote:
> Hi:
>
> I have heard that Heap-Only Tuples is introduce from 8.3.
> And I am searching information for it.
>
> How can I get a detailed information of HOT?

http://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/access/heap/README.HOT;hb=HEAD

> For example:
> according to a table, How many tuples are heap only tuples , and how
> many are not?
>
> And also , Is there any options which can influence HOT occurrance?
>
> Best Regards

--
Adrian Klaver
adrian(dot)klaver(at)gmail(dot)com

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