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Hi,
Yes, you can think it that way when we have skewness, with respect to data volume, uneven distribution due to bad choice of PI, bad joins etc.But Teradata system is built for parallelism from scratch and we have to make use of its capabilities.
Maybe you can read about AWT(Amp worker task) to see more into the architecture.
Work00-- Query step coming from dispatcher
Work01-- First level of spawned work
and the standard reserve pools( 24 reserved AWTs on each amp)
Cheers,
Raja