Hello,
Just to give you explanation, I will try to explain you why I have set
the "work_mem" to 64MB.
I noticed that some of the queries have finished with an "out of memory"
because the file system on which temporary files were created was to
small. Consequently, I have increase the size of this file system and I
have set work_mem to 64MB. The query still continued to swap into
temporary files but did not finish with an "out of memory".
The next steps for me will be to :
- decrease the work_mem
- try to build PostGreSQL with 32 bits and the option "-bmaxdata:0x40000000"
- try to build PostGreSQL with 64 bits.
I will give you the results as soon as possible.
Thank you for your help.
Regards,
Alexandra DANTE
Tom Lane a écrit :
Kevin Murphy <murphy@xxxxxxxxxxxxxxx> 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
