Multiple choice technology databases

Why to Choose a Non Unique primary index instead of a unique primary index

  1. A Non Unique primary index may be more effective for query access and joins

  2. A NUPI query simplifies the optimization process in the PE

  3. A NUPI provides better data distribution

  4. A NUPI requires less disk space to store the data row

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Explanation

A Non-Unique Primary Index (NUPI) can group rows with the same index value on the same AMP, which makes query access, aggregations, and joins on those columns highly effective, despite not guaranteeing uniform distribution.