Error while taking backup in Postgresql (Could not read Block X of relation base/Y/Z)

Question

while taking a backup from my PostgrSQL Database

it showing that

pg_dump: Dumping the contents of table "gtab17" failed: PQgetResult() failed.

pg_dump: Error message from server: ERROR:  invalid page header in block 9576 of relation     base/17779/758869

pg_dump: The command was: COPY public.gtab17 (jrdetid, jrmid, acid, dr, cr, narr, ageamt) TO stdout;

i think my table gtab17 is corrupt

tried

• Vaccum Full error on this table

INFO: vacuuming "public.gtab17" ; ERROR: row is too big: size 3256104, maximum size 8160

• Analyze error

INFO: analyzing "public.gtab17" ; ERROR: invalid page header in block 9576 of relation base/17779/758869

Database : PostgreSQL 9.2
OS : Windows XP SP3 ; FILESYSTEM : NTFS

i have googled but dint get any solution to solve this

Answer 1

It means, so your data file is corrupted - a solution is relative difficult - the best way is recovery from some older backup. You can try to fix it with replacing broken data page by zeroes - but you lost some data, and without some deeper knowledgeable you can destroy more than now it is.

REFER