17.10 - HELP INDEX and Hash, Join and Covering Indexes - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
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).