16.20 - Overview - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Operators and User-Defined Functions

Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Release Date
April 2020
Content Type
Administration
Programming Reference
Publication ID
B035-1210-162K
Language
English (United States)

You can use maps to reduce downtime when adding or changing the AMPs in a configuration, or to improve performance when using small tables.

With contiguous or sparse maps, you can define which tables remain in the current configuration, and which tables move to maps in to a new configuration. You can also redistribute tables for the new maps over a period of time, instead of all at the same time.

Contiguous and sparse maps are also used to run table operators on a subset of AMPs. The SYSLIB database contains functions, and the TDMaps database contain procedures, that provide information about contiguous and sparse maps.