Enrico Sirola <enrico.sir...@gmail.com> writes:
> this morning I experienced a weird problem with our pgsql database (9.0.3):
> while performing a simple query, I receive the following error:
> Nov 11 10:24:09 <host> postgres[23395]: [7-1] ERROR:  missing chunk number 0 
> for toast value 550556127 in pg_toast_2619

Was this a transient error, or repeatable?

If it was transient, it's probably a recently-fixed issue:
http://archives.postgresql.org/pgsql-hackers/2011-10/msg01366.php
http://archives.postgresql.org/pgsql-committers/2011-11/msg00014.php

> ERROR:  duplicate key value violates unique constraint 
> "pg_statistic_relid_att_inh_index"
> DETAIL:  Key (starelid, staattnum, stainherit)=(531526103, 7, f) already 
> exists.

This seems unrelated.  Can you repeat this one?  If so, try REINDEX'ing
that index and see if the problem goes away.

It'd be worth your while to update to 9.0.5 --- we fixed a fair number
of potential data-corruption issues since January.

                        regards, tom lane

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