Constrained (Slow Path) DELETE Processing - Teradata Database

SQL Data Manipulation Language

Product
Teradata Database
Release Number
15.10
Language
English (United States)
Last Update
2018-10-06
dita:id
B035-1146
lifecycle
previous
Product Category
Teradata® Database

Constrained (Slow Path) DELETE Processing

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” on page 324.
  • 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.