renice on an I/O bound box

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Hi,

I have a query that runs for about 16 hours, it should run at least weekly.
There are also clients connecting via a website, we don't want to keep them waiting because of long DSS queries.

We use Debian Lenny.
I've noticed that renicing the process really lowers the load (in "top"), though i think we are I/O bound. Does that make any sense?

Cheers,

WBL
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