17.10 - Sparse Join Indexes - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Fundamentals

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
Programming Reference
Publication ID
English (United States)

You can create join indexes that limit the number of rows in the index to only those that are accessed when, for example, a frequently run query references only a small, well known subset of the rows of a large base table. By using a constant expression to filter the rows included in the join index, you can create what is known as a sparse index.

Any join index, whether simple or aggregate, multitable or single-table, can be sparse.

To create a sparse index, use the WHERE clause in the CREATE JOIN INDEX statement.