15.00 - Storage and Performance Considerations for Secondary Indexes - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

Product
Teradata Database
Release Number
15.00
Content Type
Programming Reference
Publication ID
B035-1184-015K
Language
English (United States)

Storage and Performance Considerations for Secondary Indexes

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.