Im looking for some ideas as to why the performance for a select statement 
takes roughly 5 times longer on AIX as on a linux system.

The disk drive on the aix platform is a 10k scsi vs the 7200 rpm drive on linux.

AIX:
sqlite> .timer on
sqlite> .output ken.out
sqlite> .read kdo.sql
CPU Time: user 26.321955 sys 6.498729
sqlite>                         

Linux:
sqlite> .timer on
sqlite> .output ken.out
sqlite> .read kdo.sql
CPU Time: user 4.648290 sys 0.888056
sqlite>                             

Thanks,
Ken

Adding pragma temp_store=2 does seem to help, it does reduce the sys time from 
6 to .5

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