Re: ERROR: could not read block 4707 of relation 1663/16384/16564: Success

[Deniz Atak <denizatak@xxxxxxxxx>]

Hi Deepak, 

thanks for your answer. Do you have any opinion about how can I find the corrupted rows? Do you know how to read:
"could not read block 4707 of relation 1663/16384/16564"


?
Also, there is one interesting thing: a very similar query like this:

select src_ip,round(sum(size)/175) from table where date>'2011.07.29' and l_date<'2011.07.30' and src_ip='255.255.255.255' group by src_ip;

works fine. But this one doesn't:

select src_ip,round((select sum(t1.size) from table t1)) from table  where date>'2011.07.29' and date<'2011.07.30' and src_ip='255.255.255.255' 


group by src_ip;

Regards,
Deniz

On Mon, Aug 1, 2011 at 10:08 AM, D M <dm.aeqa@xxxxxxxxx> wrote:

I am not sure how big your table is one way we implemented here was we selected the clean rows and outputted it to a csv file. And the rows affected we had to load from the backup, luckily we had the clean backup.

Ex: assume you have 1,2,3,4,5....100 rows and the corrupted is between 60-70. I outputted clean rows from 1-59 and 71-100 to a csv file and loaded in a new table. The corrupted was loaded back from a table. This just One of doing it. There might be more the experts here can answer very well. I am interested to see others answers as well. 

My way is time consuming and if you have a very large table or tables affected it's a nightmare to fix them. 

Good luck with your recovery.

Thanks

Deepak

On Jul 31, 2011, at 11:27 PM, Deniz Atak <denizatak@xxxxxxxxx> wrote:

Deepak, Tom thanks for answering.

Tom, we have psql 8.1.18. So you are right, this weird message is because of the old version. I will check with my colleague about the possible reasons. What can I do if there is a messed up table?

Regards,
Deniz

On Sat, Jul 30, 2011 at 11:45 PM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:

Deniz Atak <denizatak@xxxxxxxxx> writes:
> I am using postgresql on Glassfish server and I have EJB 3.0 for ORM. I am
> trying to run a query in PSQL but receiving following error:

> Local Exception Stack:
> Exception [EclipseLink-4002] (Eclipse Persistence Services -
> 2.0.0.v20091031-r5713): org.eclipse.persistence.exceptions.DatabaseException
> Internal Exception: org.postgresql.util.PSQLException: ERROR: could not read
> block 4707 of relation 1663/16384/16564: Success

What Postgres server version is that?

If it's 8.2 or older, this probably indicates a partial block at the end
of the file.  Newer versions produce a more sensible error message for
the case, but that's just cosmetic --- the real problem is a messed-up
table.  Have you had a filesystem corruption or an out-of-disk-space
condition on this machine?

                       regards, tom lane