"Rosemary Alles" <al...@ipac.caltech.edu> wrote
in message news:af79a266-b697-4924-b304-2b1feccba...@ipac.caltech.edu
> Run on a single processor, the following query is quite fast:
>
> When concurrency is introduced (simply running the query on several
> processors against the same database - say 300 instances of it) causes
> a massive slow down

Well, you may have multiple CPUs, but you only have a single hard drive. 
That drive head can't be in multiple places simultaneously.

Igor Tandetnik



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