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Here are some effects of skew PI:

Running out of space on a database: Database space is equally distributed across all AMPs on a Teradata system. If your database runs out of space, it could be out of space on just one AMP because of a skewed table.
Running out of spool: At runtime, if data is skewed on a join, one of the AMPs can run out of space, causing the query to fail.
High runtime: Skew queries tend to run more, as one of the AMPs works more than the other.

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