Elinor <elinor@wise1.tau.ac.il> writes:
> After many many minutes, it started giving these lines:
> server sent data ("D" message) without prior row description
> ("T" message)

Up till fairly recently (8.0 or maybe 7.4), libpq would do that if it
ran out of memory to hold the query result. I think you miswrote the
query and it's returning a huge number of rows. If you actually want
to fetch a huge number of rows, try using a cursor ...

regards, tom lane

---------------------------(end of broadcast)---------------------------
TIP 7: don't forget to increase your free space map settings