16.20 - HELP INDEX and Hash, Join and Covering Indexes - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1184-162K
Language
English (United States)

HELP INDEX does not report information about hash or join indexes.

HELP INDEX does report on the indexes defined on hash and join indexes, as explained in the following table:

FOR this type of index … Information is reported on the following index characteristics …
Hash
  • Primary index defined by default based on the primary index of its underlying table.
  • Primary index defined explicitly by means of the BY and ORDER BY clauses of the CREATE HASH INDEX statement.

See Specifying the Primary Index for a Hash Index for information about these primary indexes.

Join Primary index defined for the join index.

Any secondary indexes defined on the join index.

HELP INDEX does not report the ordering columns for a covering index or value-ordered join index. SHOW TABLE reports these columns (see SHOW object).