postgresql query cost values/estimates

[John Lister <john.lister@xxxxxxxxxxxxx>]

Hi, I was wondering if there are any recommended ways or tools for 
calculating the planner cost constants? Also, do the absolute values 
matter or is it simply the ratio between them? I'm about to configure a 
new server and can probably do a rough job of calculating them based on 
supposed speeds of the various components but wondered if anyone uses 
more accurate methods?

Thanks

John

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