16.20 - Storage and Performance Considerations for Secondary Indexes - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Teradata Database
Teradata Vantage NewSQL Engine
Release Number
March 2019
Content Type
Programming Reference
Publication ID
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.