ad966@poczta.onet.pl writes:
> Warning: PostgreSQL query failed: pqReadData() -- backend closed the channe=
> l unexpectedly. This probably means the backend terminated abnormally befor=
> e or while processing the request.
Can you provide a stack backtrace from the crashed backend? There
should be a core file in the database directory (if not, check
postmaster's "ulimit -c" environment setting).
regards, tom lane