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Re: How to determine which file contains which block

From: Frank Way <fgw_three(at)yahoo(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: How to determine which file contains which block
Date: 2004-01-29 14:09:34
Message-ID: 20040129140934.37876.qmail@web11604.mail.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-admin
--- Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Frank Way <fgw_three(at)yahoo(dot)com> writes:
> > After finding the ctid in (block,tuple) format, how do you know
> which
> > file in all the subdirectories under /usr/local/pgsql/data/base
> > contains that block?
> 
> The subdirectories are named after the OIDs of their databases
> (pg_database.oid column).  Individual files are named after the
> relfilenodes of their tables/indexes (pg_class.relfilenode).
> Note also that tables exceeding 1GB will be broken into gigabyte-size
> segments named nnn, nnn.1, nnn.2, etc; if you are dealing with one
> of these then you need to determine which segment to use from the
> block number.
> 
> 			regards, tom lane
> 

Thanks Tom, your answer is MUCH appreciated.....

frank



=====
Frank Way
E-Mail: fgw_three(at)yahoo(dot)com

"Place guards on all the roads and keep the troops 
from running to the rear..." MG John Buford, 1863

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