When a session logs on, Teradata Database assigns it to a workload. This workload is used is used for session management and parser-related activity for the life of the session. The session workload is logged in the SessionWDID field in DBC.DBQLogTbl.
When assigning a session workload, Teradata Database considers only the request source criteria of the workload (such as user and account name). The workload assigned to a session is the first workload in workload priority order whose request source criteria matches the logon information of the session.
Next, after Teradata Database parses a request, it classifies each request into a workload using all classification criteria and the plan created by the parser. The request can be assigned to a different workload than the session. Requests that use only the parsing engine, such as CALL, SHOW, and HELP statements will run in the session workload.