"Davide" <floods(at)libero(dot)it> writes:
> If a make a very simple query from the psql shell:
> nuovo_mercato=> SELECT * FROM prezzi;
> pqReadData() -- backend closed the channel unexpectedly.
Sounds like you have corrupted data in that table :-(. Time to
restore it from a backup, I'm afraid.
> I use postgresql 6.5.3-26 on debian GNU/linux potato
Consider updating. 7.1 is much more stable than 6.5.*.
regards, tom lane