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Skew CPU: When a query for one AMP consumes more CPU compared to the other AMPs:

1 - (AMPCPUTime / (HASHAMP()+1))/NULLIFZERO(MaxAMPCPUTime)

I/O Skew: When a query for one AMP does more I/O compared to the other AMPs:

(1-(TotalIOCount / (HASHAMP()+1))/NULLIFZERO(MaxAMPIO)

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