17.10 - Restrictions on Redefining Characters - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Advanced SQL Engine International Character Set Support

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
User Guide
Publication ID
English (United States)

Site-defined character set restrictions for networked and mainframe clients are described in the following sections.

Network clients use ASCII-compatible character sets and mainframe clients are often EBCDIC-based.


Site-defined character sets based on the ASCII character set must preserve the definition of code points 0-127. This means that you may only redefine those characters whose numeric value is 128 or greater.


When you create a custom character set based on the EBCDIC character set, you must retain a certain subset of the EBCDIC characters. The required characters are identified as shaded code points in the table.

The shaded code points must remain as defined, and the site-defined translation tables must map these code points into the correct internal Teradata Database representations.