16.10 - Using LONG VARCHAR with Unicode Character Sets - Parallel Transporter

Teradata Parallel Transporter Reference

Product
Parallel Transporter
Release Number
16.10
Published
July 2017
Content Type
Programming Reference
Publication ID
B035-2436-077K
Language
English (United States)

Teradata supports a column type of LONG VARCHAR. When dealing with single-byte character sets (both client session character set and server storage character set) a LONG VARCHAR is interpreted as VARCHAR(64000).

When processing the script and coming across a column of type LONG VARCHAR, Teradata PT interprets this column type as VARCHAR(64000). Since the column type is passed on to the operators, some jobs may not run properly.

Problems may arise when the server side storage character set is Unicode or when the LONG VARCHAR column type is used in a schema definition. This is because the combination of the client side session character set and the server storage character set can cause the LONG VARCHAR specification in a DML USING clause to mean something other than VARCHAR(64000).

In summary:

  • The use of LONG VARCHAR in a schema object definition is not recommended.
  • Do not use LONG VARCHAR with Unicode character sets. Instead, specify VARCHAR(64000).