Constrained (Slow Path) DELETE Processing - Analytics Database - Teradata Vantage

SQL Data Manipulation Language

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
2024-04-05
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lifecycle
latest
Product Category
Teradata Vantage™
The processing time for a constrained delete (DELETE WHERE) can increase when:
  • The DELETE does not meet the conditions for a fastpath delete processing. See Unconstrained Fastpath Delete Processing.
  • The FALLBACK option is specified for the table, because the rows in the secondary copy of the table must also be deleted.
  • Secondary indexes are defined for the table, because the secondary index subtable also must be updated to account for the rows deleted.

Processing time for a constrained delete can be shortened by specifying a primary index value, a USI value, or a highly selective NUSI value as the conditional expression of the WHERE clause.