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Teradata Physical Database Design by Tom Coffing, Leah Nolander

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Chapter 4 - How Joins Work Under the Covers

“They can conquer who believe they can.”

- Virgil 70 BC

Teradata Join Quiz

Which Statement is NOT true?

  1. Each Table in Teradata has a Primary Index, unless it is a NoPI table.
  2. The Primary Index is the mechanism that allows Teradata to physically distribute the rows of a table across the AMPs using a Hash Formula and the Hash Map.
  3. Each AMP Sorts its rows by the Row-ID unless it is a Partitioned table, and then it sorts first by the Partition and then by Row-ID which is actually the Row Key.
  4. For two rows to be Joined together, Teradata insists that both rows are physically on the same AMP.
  5. Teradata will either Redistribute one or both of the tables, or Duplicate the smaller table across all AMPs to ...

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