To: Achilleas Mantzios <achill@matrix.gatewaynet.com>
cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
Subject: Re: pgsql 8.3.3 "Invalid page header" leads to "FATAL: segment too
	big"
In-reply-to: <201004221516.08729.achill@matrix.gatewaynet.com> 
References: <201004221516.08729.achill@matrix.gatewaynet.com>
Comments: In-reply-to Achilleas Mantzios <achill@matrix.gatewaynet.com>
	message dated "Thu, 22 Apr 2010 14:16:08 +0200"
Date: Thu, 22 Apr 2010 10:42:33 -0400
Message-ID: <671.1271947353@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>

Achilleas Mantzios <achill@matrix.gatewaynet.com> writes:
> Then i did: (as i said i do not need the contents of msgsource - yet the contents of msgno are vital)
> dd if=/dev/zero of=/usr/local/var/lib/pgsql/data/base/125714957/125716013 seek=672720 bs=8192 count=1 

> However, after that, unfortunately i get constant postgresql server restarts with:
> FATAL:  segment too big

You got the dd command wrong and made the file size change to something
it shouldn't be.  I think you can use dd to truncate the file back to
what it should be (ie, exactly 1GB) but haven't had enough caffeine to
remember exactly how.

I think the underlying error is that block 672720 isn't going to be in
the first segment of the table --- you need to be zeroing something in
one of the other segments...

			regards, tom lane