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Re: pg_attribute file in PostgreSQL 9.0

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Steve Crawford <scrawford(at)pinpointresearch(dot)com>
Cc: Lukasz Brodziak <lukasz(dot)brodziak(at)gmail(dot)com>, pgsql-admin(at)postgresql(dot)org
Subject: Re: pg_attribute file in PostgreSQL 9.0
Date: 2012-03-07 15:01:12
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Lists: pgsql-admin
Steve Crawford <scrawford(at)pinpointresearch(dot)com> writes:
> On 03/07/2012 05:14 AM, Lukasz Brodziak wrote:
>> I have a question regarding pg_attribute. In which file it is stored
>> because the relfilenode for it shows 0 and file 1249 isn't present in
>> the folder.

> select pg_relation_filepath('pg_attribute');

>  From the docs, relfilenode is:
> "Name of the on-disk file of this relation; zero means this is a 
> "mapped" relation whose disk file name is determined by low-level state"

> However the meaning "mapped relation" and "low-level state" are 
> difficult to divine from the docs. Go with the function.

Or use pg_relation_filenode() if you want the result of the mapping.

			regards, tom lane

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