You must set up the trusted user application to issue a SET QUERY_BAND statement similar to the following when proxy users log on to Teradata Vantage:
SET QUERY_BAND = 'PROXYUSER=appluser;PROXYROLE=role;’ FOR SESSION;
SEL cola, colb FROM database1.table1;
SEL cola, colb FROM database2.table2;
...
SET QUERY_BAND = NONE FOR SESSION;
The system examines both the SET QUERY_BAND statement and the role specification in the originating GRANT CONNECT THROUGH statement to determine the operant role.
| SET QUERY_BAND statement | GRANT CONNECT THROUGH Statement | Role Used by the Trusted Session |
|---|---|---|
| PROXYROLE is omitted | WITHOUT ROLE | The default role for the matching permanent database user. |
| WITH ROLE roles | All roles specified for the proxy user in the GRANT CONNECT THROUGH statement for the user. | |
| PROXYROLE = ALL | WITHOUT ROLE | All roles granted to the matching permanent database user. |
| WITH ROLE roles | All roles specified for the proxy user in the GRANT CONNECT THROUGH statement for the user. | |
| PROXYROLE = rolename | WITHOUT ROLE | The named role, if the matching permanent database user is a member of the named role. |
| WITH ROLE roles | The named role, if the role is specified in the GRANT CONNECT THROUGH statement for the proxy user. | |
| PROXYROLE = NONE or PROXYROLE = NULL |
WITHOUT ROLE | The current role is set to NULL. The proxy user inherits the default role for the matching permanent database user. |
| WITH ROLE roles | The system returns an error. The SET QUERY_BAND statement must specify a role from the GRANT CONNECT THROUGH statement. |
For further information on the use of the SET QUERY_BAND statement for proxy user sessions, see Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144 and Teradata Vantage™ - SQL Data Definition Language Detailed Topics, B035-1184.