To answer this question, we need to understand the concept of NUPIs (Non-Unique Primary Index) and how they are used for data distribution in a database.
Option A) The statement "The increase of hash buckets has resulted in more hash collisions" is incorrect. Increasing the number of hash buckets reduces the likelihood of hash collisions, as it provides more space for the data to be distributed evenly.
Option B) The statement "Duplicate NUPI values will produce the same row hash" is correct. In a database using NUPIs, rows with duplicate NUPI values will be hashed to the same hash bucket. This ensures that rows with the same NUPI value are stored together for efficient access.
Option C) The statement "Uniform row distribution is accomplished using UPIs" is incorrect. UPIs (Unique Primary Index) are used for unique row identification, not for achieving uniform row distribution. NUPIs are typically used for data distribution across multiple AMPs (Access Module Processors) in the Teradata database.
Option D) The statement "The low-order 16 bits of the row hash are input to the hash map" is not directly related to NUPIs or data distribution. It seems to be discussing a specific implementation detail that is not relevant to the given question.
Based on the explanations above, the correct answer is Option B. Duplicate NUPI values will produce the same row hash, ensuring that rows with the same NUPI value are stored together for efficient access.