Greetings,

We've recently had database server crash due to a heavy duty disk failure and 
upon rebooting we now have a table showing corruption via the "invalid page 
header in block X" message when querying one table in particular, the rest have 
all checked out via full table dumps with no errors.

Here is what we've done so far to try to fix the table and/or recover the good 
data from it:

* REINDEX -- no good.

* Set zero_damaged_pages=on, run query that originally showed the corruption.  
This reports 3 different blocks with invalid page headers and reports that they 
are being zero'd out.  Unfortunately, subsequently querying the table the same 
blocks show as corrupt.  Well, after running the query twice with 
zero_damaged_pages=on the first one did go away but the other two remain.

* Set zero_damaged_pages=on for pg_dump.  Same results as above.

I'm unsure what to do next to get those damaged pages cleared out...

Erik Jones, Database Administrator
Engine Yard
Support, Scalability, Reliability
866.518.9273 x 260
Location: US/Pacific
IRC: mage2k






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