17.05 - UPDATE Processing Time - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)
Processing time for an UPDATE operation is longer under the following conditions:
  • When the FALLBACK option is specified for the table, because the rows in the secondary copy of the table must also be updated.
  • When a column on which one or more indexes (secondary or primary) are defined is updated.

You can shorten the processing time for an UPDATE operation by using an indexed column in the WHERE clause of the UPDATE request.

Processing time can also vary between different syntaxes used to perform the identical update operation. Use the EXPLAIN modifier to determine which syntax form produces optimal processing time.