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

SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Published
July 2021
Language
English (United States)
Last Update
2021-07-27
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B035-1184
lifecycle
previous
Product Category
Teradata Vantage™

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.