In response to Lefteris :
> Hi Arjen,
>
> so I understand from all of you that you don't consider the use of 25k
> for sorting to be the cause of the slowdown? Probably I am missing
> something on the specific sort algorithm used by PG. My RAM does fill
> up, mainly by file buffers from linux, but postgres process remains to
> 0.1% consumption of main memory. There is no way to force sort to use
> say blocks of 128MB ? wouldn't that make a difference?
The result-table fits in that piece of memory.
You have only this little table:
[ 5, 7509643 ]
[ 1, 7478969 ]
[ 4, 7453687 ]
[ 3, 7412939 ]
[ 2, 7370368 ]
[ 7, 7095198 ]
[ 6, 6425690 ]
Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99