Sebastien Boisvert <sebastienboisv...@yahoo.com> writes:
> We've received a client's database which was giving errors and refusing to be 
> backed up; at this point we do not know what's happened to the database to 
> corrupt it (likely a hardware or power failure, etc.)
> The error that is being given when trying to do selects on the affected table 
> or doing a pg_dump is:

> ERROR:  invalid attribute number 32533 for largedata

Some poking through the source code finds only one match for that error
message, which is in relcache.c.  It looks like you have a row in
pg_attribute that claims to belong to that relation, but has attnum
32533.  It would be interesting to see the results for
        select * from pg_attribute where attrelid = 'largedata'::regclass

What PG version is this exactly, on what platform?

                        regards, tom lane

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