Kevin Murphy <murphy@genome.chop.edu> writes:
> I'm certainly not an AIX expert, but I remember my 32-bit AIX programs
> being limited to 256MB of heap by default.
Hmm ... if that's the case then it'd probably explain the problem.
Alexandra had work_mem set to 64MB, so the two hashes and sort would
think they could use 3/4ths of the available heap; given that there
are other needs and our management of memory-use limitations is fairly
sloppy, that could easily translate into running out.
So the answer is either to increase the available heap or reduce
work_mem to a smaller fraction of it.
regards, tom lane