Re: Strange database corruption with PostgreSQL 7.4.x on Debian Sarge

Matthias.Pitzl@izb.de writes:
> invalid page header in block 437702 of relation "xxxx"

I concur with Scott that this sounds suspiciously like a hardware
problem ... but have you tried dumping out the bad pages with
pg_filedump or even just od?  The pattern of damage would help to
confirm or disprove the theory.

You can find pg_filedump source code at
http://sources.redhat.com/rhdb/

            regards, tom lane