Thomas Markus <t.markus@xxxxxxxxxxxxx> writes: > logfile content see http://www.rafb.net/paste/results/cvD7uk33.html It looks to me like you must have individual rows whose COPY representation requires more than half a gigabyte (maybe much more, but at least that) and the system cannot allocate enough buffer space. It could be that this is a symptom of corrupted data, if you're certain that there shouldn't be any such rows in the table. > kernel is 2.6.15-1-em64t-p4-smp, pg version is 8.1.0 32bit You really need a 64-bit PG build if you want to push multi-hundred-megabyte field values around --- otherwise there's just not enough headroom in the process address space. (Something newer than 8.1.0 would be a good idea too.) regards, tom lane