17.05 - index_specification - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1144-175K
Language
English (United States)

Index for which statistics are to be collected.

UNIQUE
The index for which statistics are to be collected is a unique index. This option is not supported for geospatial indexes, because a geospatial index must be a NUSI.
index_name
The name of the named index for which statistics are to be collected. Note that you specify column names with a named index only when it is defined with an ORDER BY clause.
ALL
The ALL option was used to create the index. You cannot use this option to collect statistics on a geospatial NUSI.
column_name_1
The names of one or more columns on which the index exists and for which statistics are to be collected.
You cannot collect statistics on columns with a data type of Period, JSON, XML, BLOB, CLOB, or any UDT other than Geospatial.
However, you can collect statistics on the BEGIN and END expressions for a Period type column.
A geospatial NUSI column cannot be specified with other columns.
Statistics can be collected on extracted portions of the JSON type. See Teradata Vantage™ - JSON Data Type, B035-1150.
ORDER BY
An ORDER BY clause was used to create the index.
ORDER BY orders the index by the contents of a single column.
You cannot use this option to collect statistics on a geospatial NUSI.
VALUES
The ORDER BY VALUES option was used to create the index.
VALUES can order a single numeric column of four bytes or less. VALUES is the default.
You cannot use this option to collect statistics on a geospatial NUSI.
HASH
The ORDER BY HASH option was used to create the index.
HASH hash-orders a single column instead of hash-ordering all columns (the default).
You cannot use this option to collect statistics on a geospatial NUSI.
column_name_2
The name of the column on which the index is ordered.
You cannot collect statistics on columns with a data type of Period, JSON, XML, BLOB, CLOB, or any UDT other than Geospatial.
However, you can collect statistics on the BEGIN and END expressions for a Period type column.
Statistics can be collected on extracted portions of the JSON type. See Teradata Vantage™ - JSON Data Type, B035-1150.