Process for Changing the Map for a Table | Teradata Vantage - A Simple Process for Changing the Map for a Table - Analytics Database - Teradata Vantage

Database Administration

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-11-03
dita:mapPath
pgf1628096104492.ditamap
dita:ditavalPath
qkf1628213546010.ditaval
dita:id
ujp1472240543947
lifecycle
latest
Product Category
Teradata Vantage™
The following process is a simple way to change the map a table uses:
  • Query the view TableToSparseMapSizingV(X). This view recommends a map for each table and identifies when the current map should be changed.
    For example, the following request produces a list of tables that Teradata recommends use a sparse map but are now using a contiguous map:
    SELECT DatabaseName, TableName FROM TDMaps.TableToSparseMapSizingV WHERE RecommendedMap LIKE '%Sparse%' AND CurrentMapKind = 'C';
    The following request produces a list of tables that Teradata recommends use a different map type (either sparse or contiguous) than what they are using now:
    SELECT DatabaseName, TableName FROM TDMaps.TableToSparseMapSizingV WHERE MapOk = 'N';
  • If you decide that a table should use a different map, either issue an ALTER TABLE request to name a different map for the table or use the Mover stored procedure, which is described later in this section. To use ALTER TABLE, you must have the DROP privilege on the table you want to alter. For more information on the ALTER TABLE request for maps, see Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.