Thread: pg_dump: dumpBlobs(): error reading large object: ERROR:

Hi!

I could not able to take total backup of my database:

uname -a:
Linux mail 2.4.18-3 #1 Thu Apr 18 07:37:53 EDT 2002 i686 unknown


select version(); :
 PostgreSQL 7.2.1 on i686-pc-linux-gnu, compiled by GCC 2.96

pg_dump command:
pg_dump -d base -Fc -Z9 -b -v -f base.dmp

pg_dump abort with this error:
pg_dump: dumpBlobs(): error reading large object: ERROR:  cannot read block
6389 of pg_largeobject_loid_pn_index: Input/output error

This error is caused by bad block on my  hard drive?

How can i do to recover database without lost blobs? Or to lose less
information?

Thanks,

Sergio Pili

Sergio Pili <sergio.pili@spm.com.ar> writes:
> pg_dump abort with this error:
> pg_dump: dumpBlobs(): error reading large object: ERROR:  cannot read block
> 6389 of pg_largeobject_loid_pn_index: Input/output error

> This error is caused by bad block on my  hard drive?

Looks like it.

> How can i do to recover database without lost blobs? Or to lose less
> information?

If the only loss is in that index, you can rebuild the index using
REINDEX.

            regards, tom lane

Tom Lane wrote:

>Sergio Pili <sergio.pili@spm.com.ar> writes:
>
>
>>pg_dump abort with this error:
>>pg_dump: dumpBlobs(): error reading large object: ERROR:  cannot read block
>>6389 of pg_largeobject_loid_pn_index: Input/output error
>>
>>
>
>
>
>>This error is caused by bad block on my  hard drive?
>>
>>
>
>Looks like it.
>
>
>
>>How can i do to recover database without lost blobs? Or to lose less
>>information?
>>
>>
>
>If the only loss is in that index, you can rebuild the index using
>REINDEX.
>
>
But still, I would not go on much longer with that Harddisk...