Re: PG_DUMP error : unexpected chunk number

Hi,

Thanks for the info.

I've sorted out my problem by recreating the table and re-insert back the data exclude the corrupted row into the newly create table. And went back to my old backup to get back the data before it corrupt. I was lucky only 1 row affected.

Regards
Louis

>________________________________
>From: Craig Ringer <ringerc(at)ringerc(dot)id(dot)au>
>To: "mailtolouis2020-postgres(at)yahoo(dot)com" <mailtolouis2020-postgres(at)yahoo(dot)com>
>Cc: Postgres <pgsql-general(at)postgresql(dot)org>
>Sent: Saturday, October 29, 2011 5:05 PM
>Subject: Re: [GENERAL] PG_DUMP error : unexpected chunk number
>
>On 10/28/2011 06:24 PM, mailtolouis2020-postgres(at)yahoo(dot)com wrote:
>> Hello,
>>
>> I think I got a big problem now, I'm not able to do pg_dump on one of my
>> production database. When I do pg_dump it give me this error:
>> pg_dump: Error message from server: ERROR: unexpected chunk number
>> 18390760 (expected 4) for toast value 92784 in pg_toast_88487
>>
>> I believe this message mean that my database is corrupted.
>
>Yup, pretty much. Check your hard drives. It's not impossible that there's a PostgreSQL bug that's caused the issue, but it's more likely going to be a hard drive, RAID array, or system memory/cpu/heat issue.
>
>For recovery: First, stop postgresql and take a file-level copy of your whole database. Keep that copy somewhere safe, in case your repair efforts make the issue worse.
>
>In this case, I'd probably try zeroing damaged pages as my first recovery effort. That's a bit of a big hammer, but might let you get a dump out. It WILL DESTROY DATA, so I'd recommend doing it by copying your backup to another directory and running a temporary postgresql instance with zero_damaged_pages enabled on it, then trying to dump from the temporary postmaster you've started. That way you don't have to mess with your original running database.
>
>See: http://www.postgresql.org/docs/current/static/runtime-config-developer.html
>
>It might help to look up which "real" table the pg_toast_88487 TOAST table is associated with, and see how important it is. Use pg_catalog for that; see the documentation.
>
>--
>Craig Ringer
>
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