DEFINER and INVOKER Authorizations | CREATE or REPLACE AUTHORIZATION | Vantage - DEFINER and INVOKER Authorizations - Advanced SQL Engine - Teradata Database

An external routine with an EXTERNAL SECURITY clause DEFINER authorization always uses the OS user authorization that is associated with the creator of the authorization object.

An external routine with an EXTERNAL SECURITY clause INVOKER authorization uses the OS user authorization that is associated with the database user who invokes it.

The following table summarizes these differences:

Note that when you define an INVOKER authorization, the database creates a second authorization named INVOKER_AUTH under the same database (see the report on the next page).

There can only be one INVOKER authorization per database, so when one is defined, the database creates one entry using the specified name and another, duplicate, entry using the name INVOKER_DEFAULT, both of which are stored in DBC.TVM. Apart from their names, the two INVOKER default entries are identical.

When you specify an EXTERNAL SECURITY INVOKER clause for a UDF, no authorization name exists. the database looks up the INVOKER_DEFAULT name in DBC.TVM for the current database, where it finds a correct entry because there can only be one per database.

If you DROP AUTHORIZATION specifying the name you created for it, the database drops both entries. See Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.

SELECT *
FROM DBC.authorizationsV
ORDER BY databasename;