How many types of Skew exist?
If you utilized unequally TD resources (CPU,AMP,IO,Disk and etc) this is called skew exists. Major are 3 types of skews (CPU skew, AMP/Data skew, IO Skew).
When data is not distributed equally on all the AMPs.
Who is taking/consuming more CPU called cpu skew.
Who perform more IO Operation? Resulting in IO Skew