17.10 - Minimizing Duplicate NUPI Row Checks - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Database Design

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
User Guide
Publication ID
B035-1094-171K
Language
English (United States)
There are several ways to minimize or even eliminate duplicate NUPI row checks while still preventing duplicate row from being inserted. This topic describes some of the ways to achieve that goal.
  • Use a non-primary index column set to define a UNIQUE constraint or USI.
  • Use multiple columns to define NUPIs in order to make the index as close to being unique as possible.
  • Keep the number of NUPI duplicate rows for each value below 100.