Home Page for the TeradataForum
 

Archives of the TeradataForum

Message Posted: Wed, 25 Jan 2012 @ 15:08:09 GMT


     
  <Prev Next>   <<First <Prev
Next>
Last>>
 


Subj:   Re: Performance Metrics: What explains this kind of observation?
 
From:   Gorner, Tomas

Anomy,

You don't give a lot of information, so just a blind shot - consider skew (both disk and CPU) of your tuned query. You can have an overall reduction in the metrics, but what a hack, if all the work is done by 1 AMP?

As for your second question - it depends. The execution time of a skewed query may change dramatically depending on overall workload. So, a query that consumes more CPU/IO/spool, but is balanced, would be probably more steady when it comes to a load/execution_time ratio.


Regards,

Tomas



     
  <Prev Next>   <<First <Prev
Next>
Last>>
 
 
 
 
 
 
 
 
 
  
  Top Home Privacy Feedback  
 
 
Copyright for the TeradataForum (TDATA-L), Manta BlueSky    
Copyright 2016 - All Rights Reserved    
Last Modified: 27 Dec 2016