17.10 - Space Considerations - 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)

Creating a secondary index causes the system to build a subtable to contain its index rows, thus adding another set of rows that requires updating each time a table row is inserted, deleted, or updated.

Secondary index subtables are also duplicated whenever a table is defined with FALLBACK.

When compression at the data block level is enabled for their primary table, secondary index subtables are not compressed. See Compression Types Supported by Vantage for more information about data block compression.