17.10 - ADD (column_name ) AUTO COMPRESS - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1144-171K
Language
English (United States)

Add autocompression for the column partition. You can add compression to a set of existing columns whether or not the table is empty or contains data. You can only specify autocompression for column-partitioned tables. 

You cannot modify the autocompression or partition storage for a column partition more than once in the same ALTER TABLE request.


AUTO COMPRESS
Applies autocompression to the column or column partition. AUTO COMPRESS is the default. Vantage applies autocompression for a physical row on a per container basis. For efficiency, the system may use the autocompression method chosen for the previous container, including not using autocompression, if that is more effective.
NO AUTO COMPRESS
The column partition containing the column is not autocompressed.