17.10 - Unique and Nonunique Primary Index Considerations - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Fundamentals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1141-171K
Language
English (United States)

In addition to uniform distribution of data and optimal access considerations, other guidelines and performance considerations apply to selecting a unique or a nonunique column set as the primary index for a table.

Other considerations can include:

  • Primary and other alternate key column sets
  • The value range seen when using predicates in a WHERE clause
  • Whether access can involve multiple rows or a spool file or both