17.10 - Storage and Performance Considerations for Secondary Indexes - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
Language
English (United States)

Secondary indexes are stored in subtables separately from their associated data and join index tables. This means that each secondary index subtable that is created requires additional disk space.

Additionally, insert, delete, and update operations require more processing time for tables with secondary indexes because the index subtables must be updated each time an indexed field in an associated row in their parent data or join index table is updated.