Storage and Performance Considerations for Secondary Indexes - Analytics Database - Teradata Vantage

SQL Data Definition Language Detailed Topics

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-07-11
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B035-1184
lifecycle
latest
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.